update fetchAndUpdateRouteDataForSystemId to include try/catch

src/loaders/ApiBasedRepositoryLoader.ts

@@ -71,6 +71,8 @@ export class ApiBasedRepositoryLoader {
     formData.set("json", JSON.stringify(formDataJsonObject));
 
     const query = new URLSearchParams(params).toString();
+
+    try {
       const response = await fetch(`${this.baseUrl}?${query}`, {
         method: "POST",
         body: formData,
@@ -90,6 +92,10 @@ export class ApiBasedRepositoryLoader {
           await this.repository.addOrUpdateRoute(constructedRoute);
         }))
       }
+    } catch(e: any) {
+      console.error(`fetchAndUpdateRouteDataForSystemId failed for system ID ${systemId}: ${e}`);
+      throw new ApiResponseError(e.message);
+    }
   }
 
   public async fetchAndUpdateStopAndPolylineDataForRoutesInExistingSystems() {