Attempt to fix the personal layer

Logic/Actors/OverpassFeatureSource.ts

@@ -53,6 +53,7 @@ export default class OverpassFeatureSource implements FeatureSource {
                     return false;
                 }
                 let minzoom = Math.min(...layoutToUse.data.layers.map(layer => layer.minzoom ?? 18));
+                console.debug("overpass source: minzoom is ", minzoom)
                 return location.zoom >= minzoom;
             }, [layoutToUse]
         );

Logic/ElementStorage.ts

@@ -69,6 +69,9 @@ export class ElementStorage {
         const debug_msg = []
         let somethingChanged = false;
         for (const k in newProperties) {
+            if(!newProperties.hasOwnProperty(k)){
+                continue;
+            }
             const v = newProperties[k];
 
             if (keptKeys[k] !== v) {

Logic/FeatureSource/FilteringFeatureSource.ts

@@ -22,7 +22,8 @@ export default class FilteringFeatureSource implements FeatureSource {
 
             const layerDict = {};
             if (layers.data.length == 0) {
-                throw "No layers defined!"
+                console.warn("No layers defined!")
+                return;
             }
             for (const layer of layers.data) {
                 layerDict[layer.layerDef.id] = layer;