Avoid crash on ExoPlayer when there are no tracks to choose from

Author: cobarx

CHANGELOG.md

@@ -6,6 +6,7 @@
 * Support video caching for iOS [#955](https://github.com/react-native-community/react-native-video/pull/955)
 * Video caching cleanups [#1172](https://github.com/react-native-community/react-native-video/pull/1172)
 * Add ipod-library support [#926](https://github.com/react-native-community/react-native-video/pull/926/files)
+* Fix crash on ExoPlayer when there are no audio tracks [#1233](https://github.com/react-native-community/react-native-video/pull/1233)
 
 ### Version 3.2.0
 * Basic fullscreen support for Android MediaPlayer [#1138](https://github.com/react-native-community/react-native-video/pull/1138)