Safeguard: prevent errors when GisStationsMeasurements is empty or missing

- Ensure createAndSetDevices.js always uses an array for measurements
- Prevents crashes if measurement data is empty

utils/devices/createAndSetDevices.js

@@ -49,13 +49,15 @@ export const createAndSetDevices = async (
     const staticDistrictData = selectGisStationsStaticDistrict(state);
     const statusDistrictData = selectGisStationsStatusDistrict(state);
     const measurementData = selectGisStationsMeasurements(state);
+    // Sicherstellen, dass measurementData immer ein Array ist
+    const safeMeasurementData = Array.isArray(measurementData) ? measurementData : [];
 
     if (!staticDistrictData?.Points?.length) return;
     const hasStatus = Array.isArray(statusDistrictData) && statusDistrictData.length > 0;
 
     const statisMap = new Map(statusDistrictData.map(s => [s.IdLD, s]));
     const measurementsMap = new Map();
-    measurementData?.forEach(m => {
+    safeMeasurementData.forEach(m => {
       if (!measurementsMap.has(m.IdLD)) {
         measurementsMap.set(m.IdLD, m);
       }
@@ -118,10 +120,10 @@ export const createAndSetDevices = async (
       marker.bindPopup(popupContent);
 
       // ✅ Tooltip (nur für System 11)
+
       if (station.System === 11 && messung) {
         const gmaMap = new Map();
-
-        measurementData?.forEach(m => {
+        safeMeasurementData.forEach(m => {
           if (!gmaMap.has(m.IdLD)) {
             gmaMap.set(m.IdLD, {});
           }