forceFetch callback when no fetch necessary

lib/Client/InternalClient.js

@@ -356,7 +356,11 @@ var InternalClient = (function () {
 			this.chunkloaderCount[server.id] = Math.ceil(server.memberCount / 1000);
 		}
 		return new Promise(function (resolve, reject) {
-			_this4.chunkloaderCallback = resolve;
+			if (!server) {
+				resolve();
+			} else {
+				_this4.chunkloaderCallback = resolve;
+			}
 		});
 	};