Error when default prop in track is omitted on Android

[chriszs]

Describe the bug I got a "Error while updating property 'config' of a view managed by : RNJWPlayerView" error box when running on Android that I was able to slowly narrow down to omitting a default property on a track in the config, e.g.:

          tracks: [
            {
              file: `${jwPlayerBase}strips/${id}-120.vtt`,
              label: 'thumbnails',
              // no 'default' prop
            },
          ],

It appears to be coming from on or around this line, despite default being marked optional in TypeScript. Maybe trackProp.hasKey("default") ? trackProp.getBoolean("default") : false would solve this.

To Reproduce Try to set a config with a track but with no default property, then run the app on Android.

Expected behavior Default defaults to false if not supplied, no error.

Screenshots / Visual evidence

[chriszs]

There may be a similar issue in sources[].default, as well as the label field in tracks and sources.