misc(aurora): simplified AuroraGuildModel a bit

aurora/importers/aurora.py

@@ -60,7 +60,7 @@ class ImportAuroraView(ui.View):
             case["target_id"] = int(case["target_id"])
             case["moderator_id"] = int(case["moderator_id"])
 
-            if "changes" not in case or not case["changes"]:
+            if not case.get("changes", None):
                 changes = []
             else:
                 if not isinstance(case["changes"], list):

aurora/models/base.py

@@ -25,7 +25,3 @@ class AuroraGuildModel(AuroraBaseModel):
 
     def dump(self) -> dict:
         return self.model_dump(exclude={"bot", "guild_id", "guild"})
-
-    def to_json(self, indent: int | None = None, file: Any | None = None, **kwargs) -> str:
-        from ..utilities.json import dump, dumps  # pylint: disable=cyclic-import
-        return dump(self.dump(), file, indent=indent, **kwargs) if file else dumps(self.dump(), indent=indent, **kwargs)