Resolve "Searching on submaps sometimes doesn't creates markers"

Closes #372 (closed)

frontend-js/src/main/js/map/marker/AbstractMarker.js

@@ -78,7 +78,7 @@ AbstractMarker.prototype._updateIcon = function () {
       self.hide();
     } else {
       googleMarker.setIcon(GuiConnector.getImgPrefix() + self.getIcon());
-      if (googleMarker.getMap() === null) {
+      if (googleMarker.getMap() === null || googleMarker.getMap() === undefined) {
         self.show();
       }
     }