[BUG FIXES] node-red-contrib-queue-gate (version 1.5.3)

Node-red-contrib-queue-gate is a node for controlling message flow, including message queueing capability. This update corrects an error that occurs when a control message is received with msg.payload undefined or null. It also improves the documentation and addresses an issue involving one of the example flows.

This version should be backward compatible with previous versions 1.5.x. Please report bugs or issues here or on GitHub.