Change JSONField, prepare_value to output str with enclosing " (#18846)

netbox/utilities/forms/fields/fields.py

@@ -111,7 +111,7 @@ class JSONField(_JSONField):
             try:
                 value = json.loads(value, cls=self.decoder)
             except json.decoder.JSONDecodeError:
-                return value
+                return f'"{value}"'
         return json.dumps(value, sort_keys=True, indent=4, ensure_ascii=False, cls=self.encoder)