fix(aurora): finally actually maybe fixed the pydantic validation error

aurora/models/moderation.py

@@ -176,8 +176,6 @@ class Moderation(AuroraGuildModel):
             if changes:
                 for change in changes:
                     change_obj_list.append(Change.from_dict(bot=bot, data=change))
-        else:
-            change_obj_list = []
 
         if result[15] is not None:
             metadata = json.loads(result[15])
@@ -201,7 +199,7 @@ class Moderation(AuroraGuildModel):
             "resolve_reason": result[12],
             "expired": bool(result[13]),
             "changes": change_obj_list,
-            "metadata": metadata,
+            "metadata": metadata if metadata else {},
         }
         logger.debug(case)
         return cls.from_dict(bot=bot, data=case)