Fix crash when picksprite is called with no sprite manager
Fix crash when picksprite is called with no sprite manager

BabylonJS/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,NicolasBuecher/Babylon.js,RaananW/Babylon.js,Kesshi/Babylon.js,sebavan/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,NicolasBuecher/Babylon.js,RaananW/Babylon.js,Kesshi/Babylon.js,RaananW/Babylon.js,NicolasBuecher/Babylon.js,Kesshi/Babylon.js