NPE check on AudioNode read
NPE check on AudioNode read

git-svn-id: f9411aee4f13664f2fc428a5b3e824fe43a079a3@8228 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

GreenCubes/jmonkeyengine,shurun19851206/jMonkeyEngine,mbenson/jmonkeyengine,InShadow/jmonkeyengine,bsmr-java/jmonkeyengine,shurun19851206/jMonkeyEngine,phr00t/jmonkeyengine,amit2103/jmonkeyengine,jMonkeyEngine/jmonkeyengine,davidB/jmonkeyengine,shurun19851206/jMonkeyEngine,nickschot/jmonkeyengine,olafmaas/jmonkeyengine,weilichuang/jmonkeyengine,danteinforno/jmonkeyengine,tr0k/jmonkeyengine,nickschot/jmonkeyengine,wrvangeest/jmonkeyengine,aaronang/jmonkeyengine,bsmr-java/jmonkeyengine,atomixnmc/jmonkeyengine,bertleft/jmonkeyengine,nickschot/jmonkeyengine,jMonkeyEngine/jmonkeyengine,amit2103/jmonkeyengine,tr0k/jmonkeyengine,GreenCubes/jmonkeyengine,InShadow/jmonkeyengine,tr0k/jmonkeyengine,skapi1992/jmonkeyengine,Georgeto/jmonkeyengine,danteinforno/jmonkeyengine,amit2103/jmonkeyengine,d235j/jmonkeyengine,OpenGrabeso/jmonkeyengine,d235j/jmonkeyengine,Georgeto/jmonkeyengine,bertleft/jmonkeyengine,mbenson/jmonkeyengine,sandervdo/jmonkeyengine,olafmaas/jmonkeyengine,weilichuang/jmonkeyengine,amit2103/jmonkeyengine,nickschot/jmonkeyengine,yetanotherindie/jMonkey-Engine,davidB/jmonkeyengine,davidB/jmonkeyengine,d235j/jmonkeyengine,danteinforno/jmonkeyengine,g-rocket/jmonkeyengine,weilichuang/jmonkeyengine,shurun19851206/jMonkeyEngine,zzuegg/jmonkeyengine,aaronang/jmonkeyengine,atomixnmc/jmonkeyengine,sandervdo/jmonkeyengine,g-rocket/jmonkeyengine,d235j/jmonkeyengine,InShadow/jmonkeyengine,OpenGrabeso/jmonkeyengine,Georgeto/jmonkeyengine,rbottema/jmonkeyengine,delftsre/jmonkeyengine,yetanotherindie/jMonkey-Engine,rbottema/jmonkeyengine,yetanotherindie/jMonkey-Engine,OpenGrabeso/jmonkeyengine,delftsre/jmonkeyengine,g-rocket/jmonkeyengine,InShadow/jmonkeyengine,atomixnmc/jmonkeyengine,wrvangeest/jmonkeyengine,d235j/jmonkeyengine,Georgeto/jmonkeyengine,danteinforno/jmonkeyengine,GreenCubes/jmonkeyengine,g-rocket/jmonkeyengine,OpenGrabeso/jmonkeyengine,yetanotherindie/jMonkey-Engine,skapi1992/jmonkeyengine,skapi1992/jmonkeyengine,g-rocket/jmonkeyengine,yetanotherindie/jMonkey-Engine,amit2103/jmonkeyengine,zzuegg/jmonkeyengine,amit2103/jmonkeyengine,rbottema/jmonkeyengine,g-rocket/jmonkeyengine,olafmaas/jmonkeyengine,davidB/jmonkeyengine,OpenGrabeso/jmonkeyengine,delftsre/jmonkeyengine,phr00t/jmonkeyengine,aaronang/jmonkeyengine,mbenson/jmonkeyengine,atomixnmc/jmonkeyengine,d235j/jmonkeyengine,danteinforno/jmonkeyengine,weilichuang/jmonkeyengine,zzuegg/jmonkeyengine,bsmr-java/jmonkeyengine,sandervdo/jmonkeyengine,Georgeto/jmonkeyengine,mbenson/jmonkeyengine,danteinforno/jmonkeyengine,atomixnmc/jmonkeyengine,shurun19851206/jMonkeyEngine,mbenson/jmonkeyengine,mbenson/jmonkeyengine,bertleft/jmonkeyengine,wrvangeest/jmonkeyengine,phr00t/jmonkeyengine,tr0k/jmonkeyengine,olafmaas/jmonkeyengine,weilichuang/jmonkeyengine,jMonkeyEngine/jmonkeyengine,bsmr-java/jmonkeyengine,delftsre/jmonkeyengine,OpenGrabeso/jmonkeyengine,wrvangeest/jmonkeyengine,zzuegg/jmonkeyengine,davidB/jmonkeyengine,aaronang/jmonkeyengine,sandervdo/jmonkeyengine,jMonkeyEngine/jmonkeyengine,shurun19851206/jMonkeyEngine,skapi1992/jmonkeyengine,Georgeto/jmonkeyengine,davidB/jmonkeyengine,bertleft/jmonkeyengine,weilichuang/jmonkeyengine,rbottema/jmonkeyengine,phr00t/jmonkeyengine,atomixnmc/jmonkeyengine,GreenCubes/jmonkeyengine,yetanotherindie/jMonkey-Engine