Added safety check to 'getGeometry' protocol.
Added safety check to 'getGeometry' protocol.

olitheolix/azrael,olitheolix/azrael,daviddeng/azrael,daviddeng/azrael,olitheolix/azrael,daviddeng/azrael,daviddeng/azrael,olitheolix/azrael,daviddeng/azrael,olitheolix/azrael