rejection is restoring allowing hide/show state properly

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

@@ -175,6 +175,9 @@ UserDbOverlay.prototype.removeSurface = function(params) {
       fitBounds : false,
       identifiedElements : elements,
     });
+  }).then(null, function(error) {
+    self.enableAddRemoveElements();
+    return Promise.reject(error);
   });
 };