fix: backwards compatibility with old settings format preventing crash on launch

libs/shared/lib/vis/visualizations/mapvis/components/MapSettings.tsx

@@ -7,6 +7,18 @@ import { MapProps } from '../mapvis';
 import { LayerSettingsType } from '../mapvis.types';
 
 export const MapSettings = ({ settings, graphMetadata, updateSettings }: VisualizationSettingsPropTypes<MapProps>) => {
+  // For backwards compatibility with older saveStates, we migrate information from settings.nodes to settings.location
+  // FIXME: this can be removed once all systems have updated their saveStates.
+  if (!('location' in settings)) {
+    settings = JSON.parse(JSON.stringify(settings));  // Undo Object.preventExtensions()
+    settings.location = Object.entries(settings.nodes)
+      .map(([k, v]) => [k, {
+        lat: (v as any).lat,
+        lon: (v as any).lon
+      }]) 
+      .reduce((obj, [k, v]) => ({...obj, [k as string]: v}), {});
+  }
+
   const DataLayerSettings = settings.layer && layerSettings?.[settings.layer];
 
   const updateLayerSettings = (updatedKeyValue: Partial<LayerSettingsType>) => {