Moved get component from object after test source is star

rest_framework/serializers.py

@@ -438,6 +438,10 @@ class BaseSerializer(WritableField):
                     raise ValidationError(self.error_messages['required'])
                 return
 
+        else:
+            if value in (None, ''):
+                into[(self.source or field_name)] = None
+            else:
                 # Set the serializer object if it exists
                 obj = get_component(self.parent.object, self.source or field_name) if self.parent.object else None
 
@@ -453,10 +457,7 @@ class BaseSerializer(WritableField):
                         reverted_data = self.restore_fields(value, {})
                         if not self._errors:
                             into.update(reverted_data)
-        else:
-            if value in (None, ''):
-                into[(self.source or field_name)] = None
-            else:
+
                 kwargs = {
                     'instance': obj,
                     'data': value,