Add hidden close button to avoid this error: TypeError: Unable to get property 'removeEventListener' of undefined or null reference    at t.prototype._closeHandler (https://static2.sharepointonline.com/files/fabric/office-ui-fabric-js/1.5.0/js/fabric.min.js:6:19978)
Add hidden close button to avoid this error:
TypeError: Unable to get property 'removeEventListener' of undefined or null reference
   at t.prototype._closeHandler (https://static2.sharepointonline.com/files/fabric/office-ui-fabric-js/1.5.0/js/fabric.min.js:6:19978)

stephenegriffin/MHA,stephenegriffin/MHA,stephenegriffin/MHA