test_list is not mandatory at the request.

master/product/Vifib/Tool/SlapTool.py

@@ -152,7 +152,7 @@ class SlapTool(BaseTool):
 
   def _isTestRun(self):
     if self.getPortalObject().MailHost.__class__.__name__ == 'DummyMailHost' \
-        or self.REQUEST['test_list']:
+        or self.REQUEST.get('test_list'):
       return True
     return False