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 => {