Fixing merge accident related to merging PR #3059 from master.

I did not go back to check when and why exactly this slipped in.

Also removing unused `msg` (oversight in PR #3059).

tests/test_methods_and_attributes.py

@@ -433,18 +433,7 @@ def test_accepts_none(msg):
         assert m.ok_none4(None) == -1
 
 
-def test_casts_none(msg):
-    """#2778: implicit casting from None to object (not pointer)"""
-    a = m.NoneCastTester()
-    assert m.ok_obj_or_none(a) == -1
-    a = m.NoneCastTester(4)
-    assert m.ok_obj_or_none(a) == 4
-    a = m.NoneCastTester(None)
-    assert m.ok_obj_or_none(a) == -1
-    assert m.ok_obj_or_none(None) == -1
-
-
-def test_casts_none(msg):
+def test_casts_none():
     """#2778: implicit casting from None to object (not pointer)"""
     a = m.NoneCastTester()
     assert m.ok_obj_or_none(a) == -1