fix: 🐛 handle None case for default_reaction_emoji in ForumChannel edit payload (Pycord-Development#2739)

* 🐛 handle None case for `default_reaction_emoji` in ForumChannel edit payload

* 📝 CHANGELOG.md

Author: Paillat-dev

CHANGELOG.md

@@ -97,6 +97,8 @@ These changes are available on the `master` branch, but have not yet been releas
   ([#2564](https://github.com/Pycord-Development/pycord/pull/2564))
 - Fixed `Subscription.renewal_sku_ids` not accepting `None` from the received payload.
   ([#2709](https://github.com/Pycord-Development/pycord/pull/2709))
+- Fixed `ForumChannel.edit` allowing `default_reaction_emoji` to be `None`
+  ([#2739](https://github.com/Pycord-Development/pycord/pull/2739))
 
 ### Changed
 

discord/abc.py

@@ -521,13 +521,17 @@ async def _edit(
                 )
             elif isinstance(default_reaction_emoji, str):
                 default_reaction_emoji = PartialEmoji.from_str(default_reaction_emoji)
+            elif default_reaction_emoji is None:
+                pass
             else:
                 raise InvalidArgument(
-                    "default_reaction_emoji must be of type: GuildEmoji | int | str"
+                    "default_reaction_emoji must be of type: GuildEmoji | int | str | None"
                 )
 
             options["default_reaction_emoji"] = (
                 default_reaction_emoji._to_forum_reaction_payload()
+                if default_reaction_emoji
+                else None
             )
 
         if options: