列表点击崩溃，及解决方案

[Alienchang]

MusicHandle 56行sdwebimageview回调，MPMediaItemArtwork的image为空就会崩溃，建议

if (!image) {
image = [UIImage new];
}
MPMediaItemArtwork *artwork = [[MPMediaItemArtwork alloc] initWithImage:image];

[Saucheong Ye]

真机iOS 9.2 点击音乐也是直接崩溃，MusicViewController 427行 removeStreamerObserver方法

[Aufree]

@Alienchang Thank you for your good suggestion.