Merge pull request #1030 from coresh/patch-1

Fixes issue of method 'setTooltip'

modules/UI/util/UIUtil.js

@@ -131,10 +131,12 @@ const TOOLTIP_POSITIONS = {
      * @param position the position of the tooltip in relation to the element
      */
     setTooltip: function (element, key, position) {
+        if (element !== null) {
             element.setAttribute('data-tooltip', TOOLTIP_POSITIONS[position]);
             element.setAttribute('data-i18n', '[content]' + key);
 
             APP.translation.translateElement($(element));
+        }      
     },
 
     /**