Fix DMChannel AttributeError in viraj cog (#10)

* fix: handle DMChannel missing category_id in viraj cog

Co-Authored-By: Oliver Ni <oliver.ni@gmail.com>

* fix: skip DMs entirely instead of using getattr

Co-Authored-By: Oliver Ni <oliver.ni@gmail.com>

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Oliver Ni <oliver.ni@gmail.com>

Author: devin-ai-integration[bot]

bmt_discord_bot/cogs/viraj.py

@@ -26,6 +26,8 @@ def _correct_text(self, match):
     async def on_message(self, message):
         if message.author.bot:
             return
+        if message.guild is None:
+            return
         if message.channel.category_id in IGNORED_CATEGORY_IDS:
             return
         if "proctor" in message.content.casefold() and random.random() < 0.05: