[Android] Check if returned cursors are not null

[Thomas Guillem]

vlc-ports/android | branch: master | Thomas Guillem <thomas at gllm.fr> | Mon Jul  6 13:29:47 2015 +0200| [3fe93728a7f185f729f1dc5405998b2f4b0ca322] | committer: Thomas Guillem

Check if returned cursors are not null

> http://git.videolan.org/gitweb.cgi/vlc-ports/android.git/?a=commit;h=3fe93728a7f185f729f1dc5405998b2f4b0ca322
---

 .../src/org/videolan/vlc/MediaDatabase.java        |  283 +++++++++++---------
 .../vlc/gui/video/VideoPlayerActivity.java         |   13 +-
 vlc-android/src/org/videolan/vlc/util/Util.java    |    2 +-
 3 files changed, 168 insertions(+), 130 deletions(-)

Diff:   http://git.videolan.org/gitweb.cgi/vlc-ports/android.git/?a=commitdiff;h=3fe93728a7f185f729f1dc5405998b2f4b0ca322