Preserve __package__ attribute from original module

Python 3 modules always have a __package__ attribute when created, initially set to None

Author: GlenWalker

test_apipkg.py

@@ -263,14 +263,14 @@ def test_initpkg_not_transfers_not_existing_attrs(monkeypatch):
     mod = ModuleType('hello')
     mod.__file__ = "hello.py"
     assert not hasattr(mod, '__path__')
-    assert not hasattr(mod, '__package__')
+    assert not hasattr(mod, '__package__') or mod.__package__ is None
     monkeypatch.setitem(sys.modules, 'hello', mod)
     apipkg.initpkg('hello', {})
     newmod = sys.modules['hello']
     assert newmod != mod
     assert newmod.__file__ == py.path.local(mod.__file__)
     assert not hasattr(newmod, '__path__')
-    assert not hasattr(newmod, '__package__')
+    assert not hasattr(newmod, '__package__') or mod.__package__ is None
 
 
 def test_initpkg_not_changing_jython_paths(monkeypatch):