Handle firstresult hooks that return None

Only return the first result when at least one result has been returned by underlying hook implementations. Fixes #68
pytest-dev · Aug 29, 2017 · e8fe1be · e8fe1be
1 parent 5ab312c
commit e8fe1be
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/pluggy/callers.py b/pluggy/callers.py
@@ -107,7 +107,8 @@ def execute(self):
                     pass
 
             if firstresult:
-                return outcome.get_result()[0]
+                result = outcome.get_result()
+                return result[0] if result else None
 
             return outcome.get_result()