[ASVideoNodeDelegate] fix for TextureGroup#291 crash (TextureGroup#292)

* Fixed bug where ASVideoNodeDelegate error reporting callback would crash an app because of not responding to selector;

refs TextureGroup#291

* updated changelog.md

* fixed typo in const name of ASVideoNodeDelegate method in delegate flags;

refs TextureGroup#292

CHANGELOG.md

@@ -25,3 +25,4 @@
 - [Fix] Fix a potential crash when cell nodes that need layout are deleted during the same runloop.  [Adlai Holler](https://github.com/Adlai-Holler) [#279](https://github.com/TextureGroup/Texture/pull/279)
 - [Batch fetching] Add ASBatchFetchingDelegate that takes scroll velocity and remaining time into account [Huy Nguyen](https://github.com/nguyenhuy) [#281](https://github.com/TextureGroup/Texture/pull/281)
 - [Fix] Fix a major regression in our image node contents caching. [Adlai Holler](https://github.com/Adlai-Holler) [#287](https://github.com/TextureGroup/Texture/pull/287)
+- [Fix] Fixed a bug where ASVideoNodeDelegate error reporting callback would crash an app because of not responding to selector. [Sergey Petrachkov](https://github.com/Petrachkov) [#291](https://github.com/TextureGroup/Texture/issues/291)

Source/ASVideoNode.mm

@@ -58,6 +58,7 @@ @interface ASVideoNode ()
     unsigned int delegateVideoNodeDidSetCurrentItem:1;
     unsigned int delegateVideoNodeDidStallAtTimeInterval:1;
     unsigned int delegateVideoNodeDidRecoverFromStall:1;
+    unsigned int delegateVideoNodeDidFailToLoadValueForKey:1;
   } _delegateFlags;
 
   BOOL _shouldBePlaying;
@@ -153,7 +154,9 @@ - (void)prepareToPlayAsset:(AVAsset *)asset withKeys:(NSArray<NSString *> *)requ
     AVKeyValueStatus keyStatus = [asset statusOfValueForKey:key error:&error];
     if (keyStatus == AVKeyValueStatusFailed) {
       NSLog(@"Asset loading failed with error: %@", error);
-      [self.delegate videoNode:self didFailToLoadValueForKey:key asset:asset error:error];
+      if (_delegateFlags.delegateVideoNodeDidFailToLoadValueForKey) {
+        [self.delegate videoNode:self didFailToLoadValueForKey:key asset:asset error:error];
+      }
     }
   }
 
@@ -604,6 +607,7 @@ - (void)setDelegate:(id<ASVideoNodeDelegate>)delegate
     _delegateFlags.delegateVideoNodeDidSetCurrentItem = [delegate respondsToSelector:@selector(videoNode:didSetCurrentItem:)];
     _delegateFlags.delegateVideoNodeDidStallAtTimeInterval = [delegate respondsToSelector:@selector(videoNode:didStallAtTimeInterval:)];
     _delegateFlags.delegateVideoNodeDidRecoverFromStall = [delegate respondsToSelector:@selector(videoNodeDidRecoverFromStall:)];
+    _delegateFlags.delegateVideoNodeDidFailToLoadValueForKey = [delegate respondsToSelector:@selector(videoNode:didFailToLoadValueForKey:asset:error:)];
   }
 }