Fix AttributeError (#923)

Author: ephemeral8997

discord/bot.py

@@ -572,13 +572,15 @@ async def sync_commands(
                 # Permissions (Roles will be converted to IDs just before Upsert for Global Commands)
                 global_permissions.append({"id": i["id"], "permissions": cmd.permissions})
 
-        for guild_id, guild_data in registered_guild_commands.items():
-            commands = registered_guild_commands[guild_id]
+        for guild_id, commands in registered_guild_commands.items():
             guild_permissions: List = []
 
             for i in commands:
                 cmd = find(lambda cmd: cmd.name == i["name"] and cmd.type == i["type"] and cmd.guild_ids is not None
                                        and (i["guild_id"]) in cmd.guild_ids, self.pending_application_commands)
+                if not cmd:
+                    # command has not been added yet
+                    continue
                 cmd.id = i["id"]
                 self._application_commands[cmd.id] = cmd