fix issue in osg.Shader ...
fix issue in osg.Shader ...

hishamabdelrahman/osgjs,gideonmay/osgjs,hishamabdelrahman/osgjs,kkuunnddaannkk/osgjs,cedricpinson/osgjs,jmirabel/osgjs,hishamabdelrahman/osgjs,jmirabel/osgjs,jtorresfabra/osgjs,cedricpinson/osgjs,jmirabel/osgjs,kkuunnddaannkk/osgjs,kkuunnddaannkk/osgjs,jtorresfabra/osgjs,gideonmay/osgjs,jtorresfabra/osgjs,gideonmay/osgjs,cedricpinson/osgjs