Fix #327 - Don't break Module.hash

lib/google/apis/core/json_representation.rb

@@ -107,7 +107,8 @@ module Google
           # @param [String] name
           #  Property name
           # @param [Hash] options
-          def hash(name, options)
+          def hash(name = nil, options = nil)
+            return super() unless name # Allow Object.hash
             set_default_options(name, options)
             super(name, options)
           end