fix(core): update

ts/smartnpm.classes.registrycache.ts

@@ -22,9 +22,11 @@ export class RegistryCache {
   }
 
   public async cacheSmartFile (fileIdArg: string, smartfileArg: plugins.smartfile.Smartfile) {
+    if (smartfileArg) {
       await this.levelCache.storeCacheEntryByKey(fileIdArg, new plugins.levelcache.CacheEntry({
         contents: Buffer.from(smartfileArg.foldToJson()),
         ttl: 60000
       }));
     }
+  }
 }