Handle closed DMs in paste uploader (#3434)

* Initial plan

* Fix paste uploader to handle closed DMs

Co-authored-by: jb3 <20439493+jb3@users.noreply.github.com>

* Use discord.Forbidden instead of importing Forbidden

Co-authored-by: jb3 <20439493+jb3@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jb3 <20439493+jb3@users.noreply.github.com>
Co-authored-by: Vivek Ashokkumar <vivekashok1221@gmail.com>

Author: 3 people

bot/exts/utils/attachment_pastebin_uploader.py

@@ -128,10 +128,13 @@ async def on_message(self, message: discord.Message) -> None:
         # Send the user a DM with the delete link for the paste.
         # The angle brackets around the remove link are required to stop Discord from visiting the URL to produce a
         # preview, thereby deleting the paste
-        await message.author.send(
-            f"[Click here](<{paste_response.removal}>) to delete the pasted attachment"
-            f" contents copied from [your message](<{message.jump_url}>)"
-        )
+        try:
+            await message.author.send(
+                f"[Click here](<{paste_response.removal}>) to delete the pasted attachment"
+                f" contents copied from [your message](<{message.jump_url}>)"
+            )
+        except discord.Forbidden:
+            log.debug(f"User {message.author} has DMs disabled, skipping delete link DM.")
 
         # Edit the bot message to contain the link to the paste.
         await bot_reply.edit(content=f"[Click here]({paste_response.link}) to see this code in our pastebin.")