Fixed #29093 -- Simplified a few lines in ModelBase.__new__().

django/db/models/base.py

@@ -78,10 +78,7 @@ class ModelBase(type):
         new_class = super_new(cls, name, bases, new_attrs, **kwargs)
         attr_meta = attrs.pop('Meta', None)
         abstract = getattr(attr_meta, 'abstract', False)
-        if not attr_meta:
-            meta = getattr(new_class, 'Meta', None)
-        else:
-            meta = attr_meta
+        meta = attr_meta or getattr(new_class, 'Meta', None)
         base_meta = getattr(new_class, '_meta', None)
 
         app_label = None