prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Unable to edit WHEN conditions from issue alert
  ### Environment
  
  SaaS (https://sentry.io/)
  
  ### Steps to Reproduce
  
  1. Create an issue alert with a few WHEN conditions
  2. Save it
  3. Go to the Alert details page
  4. Click on Edit rule
  5. Delete all the WHEN conditions
  6. Click on Save
  7. When you're back to the Alert details page, the WHEN conditions are still there, and the "Updated alert rule" message appears
  
  ### Expected Result
  
  The users should be able to edit the alert rules
  
  ### Actual Result
  
  The alert rule stays the same after editing
  
  ### Product Area
  
  Alerts
  
  ### Link
  
  _No response_
  
  ### DSN
  
  _No response_
  
  ### Version
  
  _No response_
  
  </issue>
  <code>
  [start of src/sentry/mediators/project_rules/updater.py]
  1 from django.db import router
  2 from rest_framework.request import Request
  3 
  4 from sentry.mediators.mediator import Mediator
  5 from sentry.mediators.param import Param
  6 from sentry.models import Actor, Project, Rule
  7 
  8 
  9 class Updater(Mediator):
  10     rule = Param(Rule)
  11     name = Param(str, required=False)
  12     owner = Param(int, required=False)
  13     environment = Param(int, required=False)
  14     project = Param(Project)
  15     action_match = Param(str, required=False)
  16     filter_match = Param(str, required=False)
  17     actions = Param(list, required=False)
  18     conditions = Param(list, required=False)
  19     frequency = Param(int, required=False)
  20     request = Param(Request, required=False)
  21     using = router.db_for_write(Project)
  22 
  23     def call(self):
  24         self._update_name()
  25         self._update_owner()
  26         self._update_environment()
  27         self._update_project()
  28         self._update_actions()
  29         self._update_action_match()
  30         self._update_filter_match()
  31         self._update_conditions()
  32         self._update_frequency()
  33         self.rule.save()
  34         return self.rule
  35 
  36     def _update_name(self):
  37         if self.name:
  38             self.rule.label = self.name
  39 
  40     def _update_owner(self) -> None:
  41         self.rule.owner = Actor.objects.get(id=self.owner) if self.owner else None
  42 
  43     def _update_environment(self):
  44         self.rule.environment_id = self.environment
  45 
  46     def _update_project(self):
  47         if self.project:
  48             self.rule.project = self.project
  49 
  50     def _update_actions(self):
  51         if self.actions:
  52             self.rule.data["actions"] = self.actions
  53 
  54     def _update_action_match(self):
  55         if self.action_match:
  56             self.rule.data["action_match"] = self.action_match
  57 
  58     def _update_filter_match(self):
  59         if self.filter_match:
  60             self.rule.data["filter_match"] = self.filter_match
  61 
  62     def _update_conditions(self):
  63         if self.conditions:
  64             self.rule.data["conditions"] = self.conditions
  65 
  66     def _update_frequency(self):
  67         if self.frequency:
  68             self.rule.data["frequency"] = self.frequency
  69
  [end of src/sentry/mediators/project_rules/updater.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/src/sentry/mediators/project_rules/updater.py b/src/sentry/mediators/project_rules/updater.py
  --- a/src/sentry/mediators/project_rules/updater.py
  +++ b/src/sentry/mediators/project_rules/updater.py
  @@ -60,8 +60,7 @@
               self.rule.data["filter_match"] = self.filter_match
   
       def _update_conditions(self):
  -        if self.conditions:
  -            self.rule.data["conditions"] = self.conditions
  +        self.rule.data["conditions"] = self.conditions or []
   
       def _update_frequency(self):
           if self.frequency:
  
verification_info: {"golden_diff": "diff --git a/src/sentry/mediators/project_rules/updater.py b/src/sentry/mediators/project_rules/updater.py\n--- a/src/sentry/mediators/project_rules/updater.py\n+++ b/src/sentry/mediators/project_rules/updater.py\n@@ -60,8 +60,7 @@\n             self.rule.data[\"filter_match\"] = self.filter_match\n \n     def _update_conditions(self):\n-        if self.conditions:\n-            self.rule.data[\"conditions\"] = self.conditions\n+        self.rule.data[\"conditions\"] = self.conditions or []\n \n     def _update_frequency(self):\n         if self.frequency:\n", "issue": "Unable to edit WHEN conditions from issue alert\n### Environment\n\nSaaS (https://sentry.io/)\n\n### Steps to Reproduce\n\n1. Create an issue alert with a few WHEN conditions\r\n2. Save it\r\n3. Go to the Alert details page\r\n4. Click on Edit rule\r\n5. Delete all the WHEN conditions\r\n6. Click on Save\r\n7. When you're back to the Alert details page, the WHEN conditions are still there, and the \"Updated alert rule\" message appears\n\n### Expected Result\n\nThe users should be able to edit the alert rules\n\n### Actual Result\n\nThe alert rule stays the same after editing\n\n### Product Area\n\nAlerts\n\n### Link\n\n_No response_\n\n### DSN\n\n_No response_\n\n### Version\n\n_No response_\n", "before_files": [{"content": "from django.db import router\nfrom rest_framework.request import Request\n\nfrom sentry.mediators.mediator import Mediator\nfrom sentry.mediators.param import Param\nfrom sentry.models import Actor, Project, Rule\n\n\nclass Updater(Mediator):\n    rule = Param(Rule)\n    name = Param(str, required=False)\n    owner = Param(int, required=False)\n    environment = Param(int, required=False)\n    project = Param(Project)\n    action_match = Param(str, required=False)\n    filter_match = Param(str, required=False)\n    actions = Param(list, required=False)\n    conditions = Param(list, required=False)\n    frequency = Param(int, required=False)\n    request = Param(Request, required=False)\n    using = router.db_for_write(Project)\n\n    def call(self):\n        self._update_name()\n        self._update_owner()\n        self._update_environment()\n        self._update_project()\n        self._update_actions()\n        self._update_action_match()\n        self._update_filter_match()\n        self._update_conditions()\n        self._update_frequency()\n        self.rule.save()\n        return self.rule\n\n    def _update_name(self):\n        if self.name:\n            self.rule.label = self.name\n\n    def _update_owner(self) -> None:\n        self.rule.owner = Actor.objects.get(id=self.owner) if self.owner else None\n\n    def _update_environment(self):\n        self.rule.environment_id = self.environment\n\n    def _update_project(self):\n        if self.project:\n            self.rule.project = self.project\n\n    def _update_actions(self):\n        if self.actions:\n            self.rule.data[\"actions\"] = self.actions\n\n    def _update_action_match(self):\n        if self.action_match:\n            self.rule.data[\"action_match\"] = self.action_match\n\n    def _update_filter_match(self):\n        if self.filter_match:\n            self.rule.data[\"filter_match\"] = self.filter_match\n\n    def _update_conditions(self):\n        if self.conditions:\n            self.rule.data[\"conditions\"] = self.conditions\n\n    def _update_frequency(self):\n        if self.frequency:\n            self.rule.data[\"frequency\"] = self.frequency\n", "path": "src/sentry/mediators/project_rules/updater.py"}]}