feat: remove default value for flag metadata cache

Signed-off-by: Lukas Reining <[email protected]>

Author: lukas-reining

libs/providers/ofrep-web/src/lib/ofrep-web-provider.ts

@@ -54,7 +54,7 @@ export class OFREPWebProvider implements Provider {
   private _pollingInterval: number;
   private _retryPollingAfter: Date | undefined;
   private _flagCache: FlagCache = {};
-  private _flagSetMetadataCache?: MetadataCache = {};
+  private _flagSetMetadataCache?: MetadataCache;
   private _context: EvaluationContext | undefined;
   private _pollingIntervalId?: number;