Check queue size before starting Animated batch

Summary:
Small win: if the queue is empty we shouldn't start/stop the batch.

Changelog: [Internal]

Reviewed By: rshest

Differential Revision: D36298399

fbshipit-source-id: b43c07994ba28b4c890fe52af4e81c265a3b8ac7

Libraries/Animated/NativeAnimatedHelper.js

@@ -65,16 +65,18 @@ const API = {
  },
  disableQueue: function (): void {
  invariant(NativeAnimatedModule, 'Native animated module is not available');
-
- if (Platform.OS === 'android') {
- NativeAnimatedModule.startOperationBatch();
- }
- for (let q = 0, l = queue.length; q < l; q++) {
- queue[q]();
- }
- queue.length = 0;
- if (Platform.OS === 'android') {
- NativeAnimatedModule.finishOperationBatch();
+ const queueLength = queue.length;
+ if (queueLength > 0) {
+ if (Platform.OS === 'android') {
+ NativeAnimatedModule.startOperationBatch();
+ }
+ for (let i = 0; i < queueLength; i++) {
+ queue[i]();
+ }
+ queue.length = 0;
+ if (Platform.OS === 'android') {
+ NativeAnimatedModule.finishOperationBatch();
+ }
  }
  },
  queueOperation: (fn: () => void): void => {