configd: minor regrssion in deeper nested command structures. when the requested path doesn't exist it may run out of boundaries (returning an empty string).

error in question:
.. line 310, in find_action     while type(target) is dict and action[0] in target: IndexError: list index out of range ...

src/opnsense/service/modules/processhandler.py

@@ -307,7 +307,7 @@ class ActionHandler(object):
         :return: action object or None if not found
         """
         target = self.action_map
-        while type(target) is dict and action[0] in target:
+        while type(target) is dict and len(action) > 0 and action[0] in target:
             tmp = action.pop(0)
             target = target[tmp]