Fix stack trace issue with graphQL API result handling.

gato/enumerate/repository.py

@@ -187,11 +187,18 @@ def construct_workflow_cache(self, yml_results):
             (100 nodes at a time).
         """
         for result in yml_results:
-            owner = result['nameWithOwner']
+            # If we get any malformed/missing data just skip it and
+            # Gato will fall back to the contents API for these few cases.
+            if not result:
+                continue
 
-            self.workflow_cache[owner] = list()
+            if 'nameWithOwner' not in result:
+                continue
 
+            owner = result['nameWithOwner']
+            # Empty means no yamls, so just skip.
             if not result['object']:
+                self.workflow_cache[owner] = list()
                 continue
 
             for yml_node in result['object']['entries']: