Gallery2: avoid the crash of gallery during trimming video

- Google only provides the lib of mp4 parser to support
  the video-trim feature. But some files would fail to
  trim and cause the gallery crash
- catch the IllegalStateException to avoid the crash of gallery

Change-Id: Iadda7a42d4d694c102d50d2c52a93979ba2907a7
CRs-Fixed: 523986