player nicer for missing parent Module objects for a collected function (bug triggered by oejskit)

--HG--
branch : trunk

_py/test/plugin/pytest_skipping.py

@@ -175,6 +175,7 @@ def getexpression(item, keyword):
         if cls and hasattr(cls.obj, keyword):
             return getattr(cls.obj, keyword)
         mod = item.getparent(py.test.collect.Module)
+        if mod:
             return getattr(mod.obj, keyword, None)
 
 def evalexpression(item, keyword):

testing/pytest/plugin/test_pytest_skipping.py

@@ -110,6 +110,9 @@ def test_getexpression(testdir):
 
     assert getexpression(item2, 'just')
 
+    item2.parent = None
+    assert not getexpression(item2, 'nada') 
+
 def test_evalexpression_cls_config_example(testdir):
     from _py.test.plugin.pytest_skipping import evalexpression
     item, = testdir.getitems("""