Methods w/o parameters don't have a parameters object in discovery.

apiclient/discovery.py

@@ -163,6 +163,7 @@ def createResource(http, baseUrl, model, resourceName, resourceDesc,
     pattern_params = {}  # Parameters that must match a regex
     query_params = [] # Parameters that will be used in the query string
     path_params = {} # Parameters that will be used in the base URL
+    if 'parameters' in methodDesc:
       for arg, desc in methodDesc['parameters'].iteritems():
         param = key2param(arg)
         argmap[param] = arg