Merge pull request usablica#619 from Giegling/master

Fixed issue when property wasn't able to be set, when showBullets was…

Author: afshinm

intro.js

@@ -766,7 +766,6 @@
    * @param {Object} targetElement
    */
   function _showElement(targetElement) {
-
     if (typeof (this._introChangeCallback) !== 'undefined') {
       this._introChangeCallback.call(this, targetElement.element);
     }
@@ -843,9 +842,10 @@
         _placeTooltip.call(self, targetElement.element, oldtooltipContainer, oldArrowLayer, oldHelperNumberLayer);
 
         //change active bullet
-        oldReferenceLayer.querySelector('.introjs-bullets li > a.active').className = '';
-        oldReferenceLayer.querySelector('.introjs-bullets li > a[data-stepnumber="' + targetElement.step + '"]').className = 'active';
-
+        if (self._options.showBullets) {
+            oldReferenceLayer.querySelector('.introjs-bullets li > a.active').className = '';
+            oldReferenceLayer.querySelector('.introjs-bullets li > a[data-stepnumber="' + targetElement.step + '"]').className = 'active';
+        }
         oldReferenceLayer.querySelector('.introjs-progress .introjs-progressbar').setAttribute('style', 'width:' + _getProgress.call(self) + '%;');
 
         //show the tooltip