Ignore errors fetching Factorio versions

If an error occurs trying to fetch the list of Factorio versions log a
warning and then return an empty list instead of preventing the system
from operating.

packages/controller/src/Controller.ts

@@ -112,7 +112,14 @@ export default class Controller {
 	// Cache for mod portal requests
 	modPortalCache = new Map<string, { timestamp: number, data: any[] }>();
 	// Cache for factorio versions
-	factorioVersions = new lib.ValueCache(lib.fetchFactorioVersions);
+	factorioVersions = new lib.ValueCache(async () => {
+		try {
+			return await lib.fetchFactorioVersions();
+		} catch (err: any) {
+			logger.warn(`Failed to retrieve Factorio versions ${err.message}`);
+			return [];
+		}
+	});
 
 	static async bootstrap(config: lib.ControllerConfig) {
 		let databaseDirectory = config.get("controller.database_directory");