Make it such that modules with no arguments work fine in playbooks (like ping, which is

non-sensical, but also if the user wrote a module that took none)

lib/ansible/playbook.py

@@ -378,6 +378,8 @@ class PlayBook(object):
 
         tokens = action.split(None, 1)
         module_name = tokens[0]
+        module_args = ''
+        if len(tokens) > 1:
             module_args = tokens[1]
 
         # include task specific vars