all info windows create content div as a promise

frontend-js/src/main/js/map/window/AbstractInfoWindow.js

@@ -34,7 +34,7 @@ function AbstractInfoWindow(abstractMarker, map) {
   var onOverlayFullViewChanged = function(e) {
     var self = e.object;
     // first change the content of the element
-    self.update().then(function(){
+    self.update().then(function() {
       if (e.newVal) {
         var element = new IdentifiedElement({
           objectId : self.getElementId(),
@@ -353,12 +353,9 @@ AbstractInfoWindow.prototype._updateContent = function() {
   var contentDiv = null;
   var self = this;
 
-  return new Promise(function(resolve, reject) {
-    self.setContent(self.createWaitingContentDiv());
+  self.setContent(self.createWaitingContentDiv());
 
-    var x = self.createContentDiv();
-    resolve(x);
-  }).then(function(content) {
+  return self.createContentDiv().then(function(content) {
     contentDiv = content;
     return self.createOverlaysDiv();
   }).then(function(overlaysDiv) {

frontend-js/src/main/js/map/window/PointInfoWindow.js

@@ -32,7 +32,7 @@ PointInfoWindow.prototype.createContentDiv = function() {
   title.innerHTML = "Point: " + this.pointData.getPoint();
   result.appendChild(title);
 
-  return result;
+  return Promise.resolve(result);
 };
 
 PointInfoWindow.prototype.getOverlaysData = function(general) {

frontend-js/src/main/js/map/window/ReactionInfoWindow.js

@@ -41,16 +41,7 @@ ReactionInfoWindow.prototype.constructor = ReactionInfoWindow;
  * @returns {String} representing html code for content of the info window
  */
 ReactionInfoWindow.prototype.createContentDiv = function() {
-  if (this._reactionData !== undefined) {
-    var content = document.createElement("div");
-    /*
-     * var title = document.createElement("h3"); title.innerHTML =
-     * "ReactionInfoWindow is not yet implemented."; content.appendChild(title)
-     */
-    return content;
-  } else {
-    return null;
-  }
+  return Promise.resolve(document.createElement("div"));
 };
 
 /**