fix(ReactExoplayerView): return unset track index when there are no t…

…rack available

This fix was integrated on version 4.0.0. We need it in order to fix a problem
on Android, where the video freezes on the first frame when using a remote url
instead of an asset.

link to the upstream PR:
TheWidlarzGroup#1233

android-exoplayer/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -827,6 +827,9 @@ public void setSelectedTrack(int trackType, String type, Dynamic value) {
     }
 
     private int getTrackIndexForDefaultLocale(TrackGroupArray groups) {
+        if (groups.length == 0) { // Avoid a crash if we try to select a non-existant group
+            return C.INDEX_UNSET;
+        }
         int trackIndex = 0; // default if no match
         String locale2 = Locale.getDefault().getLanguage(); // 2 letter code
         String locale3 = Locale.getDefault().getISO3Language(); // 3 letter code