A patch for ExtJS 4.2 Ext.tip.ToolTip It hides empty tooltips (the default behavior is to show empty border)

extjs-tooltip-hideEmpty.js

tips: {
  // ...
	renderer: function (storeItem, item) {
		if (/* want to hide condition ... */) {
			this.update();
			return;
		}
    // ... the code for regualr tips we want to show
	},
	listeners:
	{
		beforeshow: {
			fn: function (tip) {
				// Patch : Show the tip only if has content
				return tip.layout.owner.html != undefined;
			}
		}
	}
},