FIX: quvi_subtitle_select: If lang count is zero
FIX: quvi_subtitle_select: If lang count is zero

_default:
  If the support script failed to return any subtitles for the media,
  then return NULL.

Signed-off-by: Toni Gundogdu <eac2284b3c43676907b96f08de9d3d52d5df0361@gmail.com>

legatvs/libquvi,legatvs/libquvi,legatvs/libquvi