We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
styling of categories in dashboard (Safari)
When using Safari the styling of categories in the dashboard is broken. 

![safari styling issue](https://user-images.githubusercontent.com/15954895/28914159-fe84edde-783a-11e7-8ae4-09f0a6b978cd.png)


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `euth/ideas/forms.py`
Content:
```
1 from adhocracy4.categories import forms as category_forms
2 
3 from . import models
4 
5 
6 class IdeaForm(category_forms.CategorizableForm):
7     class Meta:
8         model = models.Idea
9         fields = ['name', 'description', 'image', 'category']
10
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/euth/ideas/forms.py b/euth/ideas/forms.py
--- a/euth/ideas/forms.py
+++ b/euth/ideas/forms.py
@@ -7,3 +7,7 @@
     class Meta:
         model = models.Idea
         fields = ['name', 'description', 'image', 'category']
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields['category'].empty_label = '---'

{"golden_diff": "diff --git a/euth/ideas/forms.py b/euth/ideas/forms.py\n--- a/euth/ideas/forms.py\n+++ b/euth/ideas/forms.py\n@@ -7,3 +7,7 @@\n     class Meta:\n         model = models.Idea\n         fields = ['name', 'description', 'image', 'category']\n+\n+    def __init__(self, *args, **kwargs):\n+        super().__init__(*args, **kwargs)\n+        self.fields['category'].empty_label = '---'\n", "issue": "styling of categories in dashboard (Safari)\nWhen using Safari the styling of categories in the dashboard is broken. \r\n\r\n![safari styling issue](https://user-images.githubusercontent.com/15954895/28914159-fe84edde-783a-11e7-8ae4-09f0a6b978cd.png)\r\n\n", "before_files": [{"content": "from adhocracy4.categories import forms as category_forms\n\nfrom . import models\n\n\nclass IdeaForm(category_forms.CategorizableForm):\n    class Meta:\n        model = models.Idea\n        fields = ['name', 'description', 'image', 'category']\n", "path": "euth/ideas/forms.py"}], "after_files": [{"content": "from adhocracy4.categories import forms as category_forms\n\nfrom . import models\n\n\nclass IdeaForm(category_forms.CategorizableForm):\n    class Meta:\n        model = models.Idea\n        fields = ['name', 'description', 'image', 'category']\n\n    def __init__(self, *args, **kwargs):\n        super().__init__(*args, **kwargs)\n        self.fields['category'].empty_label = '---'\n", "path": "euth/ideas/forms.py"}]}