[Mangui.DemuxHelper] Make probe Level parameter optional

Selection logic ensures proper Demuxer is used anyway

Author: hparra

src/org/mangui/hls/demux/DemuxHelper.as

@@ -26,17 +26,17 @@
  * if mp3_match && codec_mp3 => MP3 demuxer
  * if no codec info in Manifest, use fallback order : AAC/MP3/TS
  */
- if (ts_match && level.codec_h264) {
+ if (ts_match && level && level.codec_h264) {
  CONFIG::LOGGING {
  Log.debug("TS match + H264 signaled in Manifest, use TS demuxer");
  }
  return new TSDemuxer(audioselect, progress, complete, videometadata, audioOnly);
- } else if (aac_match && level.codec_aac) {
+ } else if (aac_match && level && level.codec_aac) {
  CONFIG::LOGGING {
  Log.debug("AAC match + AAC signaled in Manifest, use AAC demuxer");
  }
  return new AACDemuxer(audioselect, progress, complete, id3tagfound);
- } else if (mp3_match && level.codec_mp3) {
+ } else if (mp3_match && level && level.codec_mp3) {
  CONFIG::LOGGING {
  Log.debug("MP3 match + MP3 signaled in Manifest, use MP3 demuxer");
  }