Don't call updateLayers if the new state has no layer config

Fixes #719

diff --git a/app/assets/javascripts/leaflet.map.js.erb b/app/assets/javascripts/leaflet.map.js.erb
index 35370ae996108be6058ecc5b8cb8f8149d53bf49..496e2985859df30fc2d4811bb3c22aa5d457a55b 100644 (file)
--- a/app/assets/javascripts/leaflet.map.js.erb
+++ b/app/assets/javascripts/leaflet.map.js.erb
@@ -241,7 +241,7 @@ L.OSM.Map = L.Map.extend({
 
   setState: function(state, options) {
     if (state.center) this.setView(state.center, state.zoom, options);
-    this.updateLayers(state.layers);
+    if (state.layers) this.updateLayers(state.layers);
   }
 });