added new circumstance of having NONE as the second object of a union with warning message

Author: kr321

mypy/messages.py

@@ -522,23 +522,12 @@ def has_no_attr(
                     type(item) == NoneType for item in original_type.items
                 ):
                     typ_format = '"None"'
-                if typ_format == '"None"':(
-                    self.fail(
-                        'Item {} of {} has no attribute "{}"{}. ADD HINT HERE'.format(
-                            typ_format, orig_type_format, member, extra
-                        ),
-                        context,
-                        code=codes.UNION_ATTR,
-                    )
-                )
-                else:(
-                    self.fail(
-                        'Item {} of {} has no attribute "{}"{}'.format(
-                            typ_format, orig_type_format, member, extra
-                        ),
-                        context,
-                        code=codes.UNION_ATTR,
-                    )
+                self.fail(
+                    'Item {} of {} has no attribute "{}"{}'.format(
+                        typ_format, orig_type_format, member, extra
+                    ),
+                    context,
+                    code=codes.UNION_ATTR,
                 )
                 return codes.UNION_ATTR
             elif isinstance(original_type, TypeVarType):