prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Add an `attachments` rule
  # Abstract 
  
  We should have an antispam rule filtering small burst of images. 
  
  # Rationale
  
  Currently, when a user posts 4 images in less than 10 seconds without any comment, the `duplicates` rule will trigger. While we still want to be informed when many images are posted, having the `duplicates` rule trigger doesn't make much sense. Besides, if different message content is given for each image, it will only trigger `burst` if more than 9 messages are sent in 10 seconds. 
  
  # Specification
  
  - [ ] Make sure that the `duplicates` filter won't be triggered by messages with images. We can safely skip empty messages with attachments.
  - [ ] Create an `images` filter based on `duplicates` that will trigger when more than 3 images are posted in less than 10 seconds. It should ignore the message content. 
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `bot/rules/duplicates.py`
  Content:
  ```
  1 from typing import Dict, Iterable, List, Optional, Tuple
  2 
  3 from discord import Member, Message
  4 
  5 
  6 async def apply(
  7     last_message: Message, recent_messages: List[Message], config: Dict[str, int]
  8 ) -> Optional[Tuple[str, Iterable[Member], Iterable[Message]]]:
  9     """Detects duplicated messages sent by a single user."""
  10     relevant_messages = tuple(
  11         msg
  12         for msg in recent_messages
  13         if (
  14             msg.author == last_message.author
  15             and msg.content == last_message.content
  16         )
  17     )
  18 
  19     total_duplicated = len(relevant_messages)
  20 
  21     if total_duplicated > config['max']:
  22         return (
  23             f"sent {total_duplicated} duplicated messages in {config['interval']}s",
  24             (last_message.author,),
  25             relevant_messages
  26         )
  27     return None
  28
  ```
  --- 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()
  
  ```
  
golden_diff: diff --git a/bot/rules/duplicates.py b/bot/rules/duplicates.py
  --- a/bot/rules/duplicates.py
  +++ b/bot/rules/duplicates.py
  @@ -13,6 +13,7 @@
           if (
               msg.author == last_message.author
               and msg.content == last_message.content
  +            and msg.content
           )
       )
  
verification_info: {"golden_diff": "diff --git a/bot/rules/duplicates.py b/bot/rules/duplicates.py\n--- a/bot/rules/duplicates.py\n+++ b/bot/rules/duplicates.py\n@@ -13,6 +13,7 @@\n         if (\n             msg.author == last_message.author\n             and msg.content == last_message.content\n+            and msg.content\n         )\n     )\n", "issue": "Add an `attachments` rule\n# Abstract \r\n\r\nWe should have an antispam rule filtering small burst of images. \r\n\r\n# Rationale\r\n\r\nCurrently, when a user posts 4 images in less than 10 seconds without any comment, the `duplicates` rule will trigger. While we still want to be informed when many images are posted, having the `duplicates` rule trigger doesn't make much sense. Besides, if different message content is given for each image, it will only trigger `burst` if more than 9 messages are sent in 10 seconds. \r\n\r\n# Specification\r\n\r\n- [ ] Make sure that the `duplicates` filter won't be triggered by messages with images. We can safely skip empty messages with attachments.\r\n- [ ] Create an `images` filter based on `duplicates` that will trigger when more than 3 images are posted in less than 10 seconds. It should ignore the message content. \n", "before_files": [{"content": "from typing import Dict, Iterable, List, Optional, Tuple\n\nfrom discord import Member, Message\n\n\nasync def apply(\n    last_message: Message, recent_messages: List[Message], config: Dict[str, int]\n) -> Optional[Tuple[str, Iterable[Member], Iterable[Message]]]:\n    \"\"\"Detects duplicated messages sent by a single user.\"\"\"\n    relevant_messages = tuple(\n        msg\n        for msg in recent_messages\n        if (\n            msg.author == last_message.author\n            and msg.content == last_message.content\n        )\n    )\n\n    total_duplicated = len(relevant_messages)\n\n    if total_duplicated > config['max']:\n        return (\n            f\"sent {total_duplicated} duplicated messages in {config['interval']}s\",\n            (last_message.author,),\n            relevant_messages\n        )\n    return None\n", "path": "bot/rules/duplicates.py"}], "after_files": [{"content": "from typing import Dict, Iterable, List, Optional, Tuple\n\nfrom discord import Member, Message\n\n\nasync def apply(\n    last_message: Message, recent_messages: List[Message], config: Dict[str, int]\n) -> Optional[Tuple[str, Iterable[Member], Iterable[Message]]]:\n    \"\"\"Detects duplicated messages sent by a single user.\"\"\"\n    relevant_messages = tuple(\n        msg\n        for msg in recent_messages\n        if (\n            msg.author == last_message.author\n            and msg.content == last_message.content\n            and msg.content\n        )\n    )\n\n    total_duplicated = len(relevant_messages)\n\n    if total_duplicated > config['max']:\n        return (\n            f\"sent {total_duplicated} duplicated messages in {config['interval']}s\",\n            (last_message.author,),\n            relevant_messages\n        )\n    return None\n", "path": "bot/rules/duplicates.py"}]}