Fix making changes to relations

Logic/Osm/OsmObject.ts

@@ -439,6 +439,8 @@ export class OsmWay extends OsmObject {
             const node = nodeDict.get(nodeId)
             if(node === undefined){
                 console.error("Error: node ", nodeId, "not found in ", nodeDict)
+                // This is probably part of a relation which hasn't been fully downloaded
+                continue;
             }
             const cp = node.centerpoint();
             this.coordinates.push(cp);