From 320979ece56e10c76ff6b7239c0fb360f76437ff Mon Sep 17 00:00:00 2001
From: AntiMoron <anti2moron@gmail.com>
Date: Tue, 22 May 2018 12:13:19 +0800
Subject: [PATCH] Update WXRecyclerUpdateController.m

Fix one crash.

```
*** -[__NSDictionaryM setObject:forKey:]: key cannot be nil
```

This exception will be yelled at line 167.
---
 .../Sources/Component/Recycler/WXRecyclerUpdateController.m      | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ios/sdk/WeexSDK/Sources/Component/Recycler/WXRecyclerUpdateController.m b/ios/sdk/WeexSDK/Sources/Component/Recycler/WXRecyclerUpdateController.m
index 7435c8de4d..5f92f2993b 100644
--- a/ios/sdk/WeexSDK/Sources/Component/Recycler/WXRecyclerUpdateController.m
+++ b/ios/sdk/WeexSDK/Sources/Component/Recycler/WXRecyclerUpdateController.m
@@ -146,6 +146,7 @@ - (void)performBatchUpdates
         [self.delegate updateController:self willPerformUpdateWithNewData:newData];
         [UIView setAnimationsEnabled:NO];
         WXLogDebug(@"UICollectionView update:%@", diffResult);
+        if(!diffResult.hasChanges) { return ; }
         [self applyUpdate:diffResult toCollectionView:self.collectionView];
     } copy];