[Android] Subs downloader: prevent NPE & code optimizations

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Tue Oct  3 12:05:54 2017 +0200| [dc7d9a66aa3ed3f315cdd972999eda0ab5add006] | committer: Geoffrey Métais

Subs downloader: prevent NPE & code optimizations

> https://code.videolan.org/videolan/vlc-android/commit/dc7d9a66aa3ed3f315cdd972999eda0ab5add006
---

 .../org/videolan/vlc/util/SubtitlesDownloader.java | 88 ++++++++++------------
 1 file changed, 41 insertions(+), 47 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/dc7d9a66aa3ed3f315cdd972999eda0ab5add006