Test program: check track initialization
Test program: check track initialization

Stop in case the track initialization fails.  This fixes a crash.

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