Webviewer now removes non-existing objects.
Webviewer now removes non-existing objects.

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