Merge pull request #270 from njwilson/fix-exit-code

Fix CLI exit code

lettuce/bin.py

@@ -79,7 +79,7 @@ def main(args=sys.argv[1:]):
     )
 
     result = runner.run()
-    failed = bool(result or result.steps != result.steps_passed)
+    failed = result is None or result.steps != result.steps_passed
     raise SystemExit(int(failed))
 
 if __name__ == '__main__':