auto-t: wpas.py: allow arbitrary events to be handled

If an event is in response to some command which is returning an
unexpected value (unexpected with respect to wpas.py) handle_eow
would raise an exception.

Specifically with DPP this was being hit when the URI was being
returned.

autotests/util/wpas.py

@@ -88,8 +88,6 @@ class Wpas:
         def handle_eow():
             nonlocal key, value, count, event
             if count == 0:
-                if key is not None or not value:
-                    raise Exception('Bad event name')
                 key = 'event'
             elif key is None:
                 if not value: