We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Add front-end extension capability
This is similar in concept to https://github.com/getredash/redash/pull/2354/files

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `redash/extensions.py`
Content:
```
1 from pkg_resources import iter_entry_points
2 
3 
4 def init_extensions(app):
5     """
6     Load the Redash extensions for the given Redash Flask app.
7     """
8     if not hasattr(app, 'redash_extensions'):
9         app.redash_extensions = {}
10 
11     for entry_point in iter_entry_points('redash.extensions'):
12         app.logger.info('Loading Redash extension %s.', entry_point.name)
13         extension = entry_point.load()
14         app.redash_extensions[entry_point.name] = extension(app)
15
```
--- 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/redash/extensions.py b/redash/extensions.py
--- a/redash/extensions.py
+++ b/redash/extensions.py
@@ -1,4 +1,5 @@
-from pkg_resources import iter_entry_points
+import os
+from pkg_resources import iter_entry_points, resource_isdir, resource_listdir
 
 
 def init_extensions(app):
@@ -10,5 +11,20 @@
 
     for entry_point in iter_entry_points('redash.extensions'):
         app.logger.info('Loading Redash extension %s.', entry_point.name)
-        extension = entry_point.load()
-        app.redash_extensions[entry_point.name] = extension(app)
+        try:
+            extension = entry_point.load()
+            app.redash_extensions[entry_point.name] = {
+                "entry_function": extension(app),
+                "resources_list": []
+            }
+        except ImportError:
+            app.logger.info('%s does not have a callable and will not be loaded.', entry_point.name)
+            (root_module, _) = os.path.splitext(entry_point.module_name)
+            content_folder_relative = os.path.join(entry_point.name, 'bundle')
+
+            # If it's a frontend extension only, store a list of files in the bundle directory.
+            if resource_isdir(root_module, content_folder_relative):
+                app.redash_extensions[entry_point.name] = {
+                    "entry_function": None,
+                    "resources_list": resource_listdir(root_module, content_folder_relative)
+                }

{"golden_diff": "diff --git a/redash/extensions.py b/redash/extensions.py\n--- a/redash/extensions.py\n+++ b/redash/extensions.py\n@@ -1,4 +1,5 @@\n-from pkg_resources import iter_entry_points\n+import os\n+from pkg_resources import iter_entry_points, resource_isdir, resource_listdir\n \n \n def init_extensions(app):\n@@ -10,5 +11,20 @@\n \n     for entry_point in iter_entry_points('redash.extensions'):\n         app.logger.info('Loading Redash extension %s.', entry_point.name)\n-        extension = entry_point.load()\n-        app.redash_extensions[entry_point.name] = extension(app)\n+        try:\n+            extension = entry_point.load()\n+            app.redash_extensions[entry_point.name] = {\n+                \"entry_function\": extension(app),\n+                \"resources_list\": []\n+            }\n+        except ImportError:\n+            app.logger.info('%s does not have a callable and will not be loaded.', entry_point.name)\n+            (root_module, _) = os.path.splitext(entry_point.module_name)\n+            content_folder_relative = os.path.join(entry_point.name, 'bundle')\n+\n+            # If it's a frontend extension only, store a list of files in the bundle directory.\n+            if resource_isdir(root_module, content_folder_relative):\n+                app.redash_extensions[entry_point.name] = {\n+                    \"entry_function\": None,\n+                    \"resources_list\": resource_listdir(root_module, content_folder_relative)\n+                }\n", "issue": "Add front-end extension capability\nThis is similar in concept to https://github.com/getredash/redash/pull/2354/files\n", "before_files": [{"content": "from pkg_resources import iter_entry_points\n\n\ndef init_extensions(app):\n    \"\"\"\n    Load the Redash extensions for the given Redash Flask app.\n    \"\"\"\n    if not hasattr(app, 'redash_extensions'):\n        app.redash_extensions = {}\n\n    for entry_point in iter_entry_points('redash.extensions'):\n        app.logger.info('Loading Redash extension %s.', entry_point.name)\n        extension = entry_point.load()\n        app.redash_extensions[entry_point.name] = extension(app)\n", "path": "redash/extensions.py"}], "after_files": [{"content": "import os\nfrom pkg_resources import iter_entry_points, resource_isdir, resource_listdir\n\n\ndef init_extensions(app):\n    \"\"\"\n    Load the Redash extensions for the given Redash Flask app.\n    \"\"\"\n    if not hasattr(app, 'redash_extensions'):\n        app.redash_extensions = {}\n\n    for entry_point in iter_entry_points('redash.extensions'):\n        app.logger.info('Loading Redash extension %s.', entry_point.name)\n        try:\n            extension = entry_point.load()\n            app.redash_extensions[entry_point.name] = {\n                \"entry_function\": extension(app),\n                \"resources_list\": []\n            }\n        except ImportError:\n            app.logger.info('%s does not have a callable and will not be loaded.', entry_point.name)\n            (root_module, _) = os.path.splitext(entry_point.module_name)\n            content_folder_relative = os.path.join(entry_point.name, 'bundle')\n\n            # If it's a frontend extension only, store a list of files in the bundle directory.\n            if resource_isdir(root_module, content_folder_relative):\n                app.redash_extensions[entry_point.name] = {\n                    \"entry_function\": None,\n                    \"resources_list\": resource_listdir(root_module, content_folder_relative)\n                }\n", "path": "redash/extensions.py"}]}