when there is no background don't check if overlay is nested

CHANGELOG

+minerva (14.0.6) stable; urgency=medium
+  * Bug fix: opening map with no background overlays and search request in url
+    provides proper error message (#1046)
+
 minerva (14.0.5) stable; urgency=medium
   * Bug fix: copy-paste of genetic-variant data overlay into Add overlay 
     content dialog could crash upload (#1040)
@@ -19,7 +23,6 @@ minerva (14.0.5) stable; urgency=medium
   * Bug fix: CLEAR button disappears after legend, comment checkboxes when 
     plugin tab used to much space (#976)
 
-
  -- Piotr Gawron <piotr.gawron@uni.lu>  Tue, 03 Dec 2019 12:00:00 +0200
 
 minerva (14.0.4) stable; urgency=high

frontend-js/src/main/js/map/overlay/SearchDbOverlay.js

@@ -279,7 +279,7 @@ SearchDbOverlay.prototype.searchByCoordinates = function (params) {
       if (elements.length === 0) {
         return undefined;
       } else {
-        if (self.getMap().getBackgroundDataOverlay().getName() === nestedOverlay) {
+        if (self.getMap().getBackgroundDataOverlay() !== null && self.getMap().getBackgroundDataOverlay().getName() === nestedOverlay) {
           return self._getFirstVisibleParentOrObject(elements[0], zoom - model.getMinZoom(), coordinates);
         } else {
           return elements[0];