Now raises an NameError exception when a None handler is attached to the connection.

sjrpc/core/rpcconnection.py

@@ -290,6 +290,12 @@ class RpcConnection(object):
                         ThreadedRpcCaller(message, self, func).start()
                     else:
                         RpcCaller(message, self, func).start()
+            else:
+				self.error(
+					message['id'],
+					'NameError',
+					"remote name '%s' is not defined" % message['method'],
+				)
         elif set(RpcConnection.RESPONSE_MESSAGE) <= set(message):
             # Handle response message from the peer:
             call = self._calls.get(message['id'])