Remove unrelated not_a_list error change

Author: zainnadeem786

rest_framework/serializers.py

@@ -703,16 +703,12 @@ def to_internal_value(self, data):
             data = html.parse_html_list(data, default=[])
 
         if not isinstance(data, list):
+            message = self.error_messages['not_a_list'].format(
+                input_type=type(data).__name__
+            )
             raise ValidationError({
-                api_settings.NON_FIELD_ERRORS_KEY: [
-                    ErrorDetail(
-                        self.error_messages['not_a_list'].format(
-                            input_type=type(data).__name__
-                        ),
-                        code='not_a_list'
-                    )
-                ]
-            })
+                api_settings.NON_FIELD_ERRORS_KEY: [message]
+            }, code='not_a_list')
 
         if not self.allow_empty and len(data) == 0:
             message = self.error_messages['empty']