fixed: crash in the fadelabel control if the font couldn't be found - thanks to Voyager-xbmc

(cherry picked from commit f1eae555b9972059b045e5ada62fd4d5f18a4fbf)

git-svn-id: https://xbmc.svn.sourceforge.net/svnroot/xbmc/branches/Dharma@35630 568bbfeb-2a22-0410-94d2-cc84cf5bfa90