fixes issues where osg can cause a crash on invalid ebo#1192
Open
fabausch wants to merge 1 commit intoopenscenegraph:masterfrom 
Open
fixes issues where osg can cause a crash on invalid ebo#1192fabausch wants to merge 1 commit intoopenscenegraph:masterfrom 
fabausch wants to merge 1 commit intoopenscenegraph:masterfrom