Fixes pytest discovery: Not all pytest items have own_markers (microsoft#6514)

Co-Authored-By: Eric Snow <[email protected]>

Author: rdrey

news/2 Fixes/6463.md

@@ -0,0 +1 @@
+Fixes a bug in pytest test discovery.  Patch by Rainer Dreyer.

pythonFiles/testing_tools/adapter/pytest/_pytest_item.py

@@ -188,7 +188,7 @@ def parse_item(item, _normcase, _pathsep):
     # Sort out markers.
     #  See: https://docs.pytest.org/en/latest/reference.html#marks
     markers = set()
-    for marker in item.own_markers:
+    for marker in getattr(item, 'own_markers', []):
         if marker.name == 'parameterize':
             # We've already covered these.
             continue