fix crash with 'stsd' wrong entry (no data)
fix crash with 'stsd' wrong entry (no data)

git-svn-id: ab66a9de07fa9d47c5829c82992f5279466c775f@4628 63c20433-aa62-49bd-875c-5a186b69a8fb

rbouqueau/gpac_brew_travis,emmanouil/gpac,Bevara/Access-open,rbouqueau/gpac_brew_travis,canatella/gpac,RodolpheFouquet/gpac,psteinb/gpac,epam/gpac,rbouqueau/gpac,drakeguan/gpac,nguyen-viet-thanh-trung/gpac,emmanouil/gpac,DmitrySigaev/gpac,DmitrySigaev/gpac,nguyen-viet-thanh-trung/gpac,RodolpheFouquet/gpac,RodolpheFouquet/gpac,rbouqueau/gpac,rbouqueau/gpac_brew_travis,nguyen-viet-thanh-trung/gpac,ARSekkat/gpac,rbouqueau/gpac,DmitrySigaev/gpac,rbouqueau/gpac_brew_travis,psteinb/gpac,nguyen-viet-thanh-trung/gpac,vladimir-kazakov/gpac,epam/gpac,ARSekkat/gpac,rauf/gpac,ARSekkat/gpac,RodolpheFouquet/gpac,porcelijn/gpac,gpac/gpac,rbouqueau/gpac_brew_travis,aymanelyaagoubi/gpac,rauf/gpac,canatella/gpac,rbouqueau/gpac,Bevara/Access-open,DmitrySigaev/gpac,rbouqueau/gpac,drakeguan/gpac,aymanelyaagoubi/gpac,drakeguan/gpac,nguyen-viet-thanh-trung/gpac,emmanouil/gpac,ARSekkat/gpac,psteinb/gpac,RodolpheFouquet/gpac,epam/gpac,psteinb/gpac,Bevara/Access-open,gpac/gpac,gpac/gpac,rauf/gpac,rauf/gpac,nguyen-viet-thanh-trung/gpac,canatella/gpac,aymanelyaagoubi/gpac,ARSekkat/gpac,canatella/gpac,epam/gpac,vladimir-kazakov/gpac,vladimir-kazakov/gpac,psteinb/gpac,gpac/gpac,DmitrySigaev/gpac,psteinb/gpac,emmanouil/gpac,gpac/gpac,gpac/gpac,RodolpheFouquet/gpac,vladimir-kazakov/gpac,epam/gpac,rbouqueau/gpac,gpac/gpac,rbouqueau/gpac,porcelijn/gpac,Bevara/Access-open,canatella/gpac,canatella/gpac,vladimir-kazakov/gpac,rauf/gpac,drakeguan/gpac,porcelijn/gpac,Bevara/Access-open,gpac/gpac,ARSekkat/gpac,emmanouil/gpac,drakeguan/gpac,rbouqueau/gpac,aymanelyaagoubi/gpac,rbouqueau/gpac_brew_travis,rauf/gpac,porcelijn/gpac,canatella/gpac,emmanouil/gpac,aymanelyaagoubi/gpac,epam/gpac,aymanelyaagoubi/gpac,DmitrySigaev/gpac,vladimir-kazakov/gpac,drakeguan/gpac,porcelijn/gpac,Bevara/Access-open,porcelijn/gpac