Fix crash because of last_glyph < first_glyph, probably caused by first line only consisting of '\n'
Fix crash because of last_glyph < first_glyph, probably caused by first line
only consisting of '\n'


git-svn-id: 947b4ff483bb4cc5004120385d99e48ac0944466@20232 b3059339-0415-0410-9bf9-f77b7e298cf2

richardpl/libass,tgoyne/libass,astiob/libass,richardpl/libass,Distrotech/libass,torque/libass,pigoz/libass-ct,torque/libass,tgoyne/libass,rhlee/libass,asimonov-im/libass,Distrotech/libass,asimonov-im/libass,pigoz/libass-ct,libass/libass,xbmc/libass,tgoyne/libass,xbmc/libass,mwgoldsmith/libass,MrSmile/libass,torque/libass,astiob/libass,pigoz/libass-ct,ShiftMediaProject/libass,Akemi/libass,sanyaade-g2g-repos/libass,ShiftMediaProject/libass,Akemi/libass,Akemi/libass,vault/libass,grigorig/libass,sanyaade-g2g-repos/libass,mwgoldsmith/libass,stps/libass,MrSmile/libass,sanyaade-g2g-repos/libass,blinkseb/libass,grigorig/libass,stps/libass,vault/libass,blinkseb/libass,stps/libass,rhlee/libass,libass/libass,mwgoldsmith/libass,richardpl/libass,rhlee/libass,Distrotech/libass,blinkseb/libass