From Richard: i) Fix problem with loading of some geometries - child objects were not always being sent causing incorrect caching inside viewer.
From Richard:
i) Fix problem with loading of some geometries - child objects were not
always being sent causing incorrect caching inside viewer.

ii) Also replace all rest of asserts in TGLViewer with Error messages -
remaining asserts elsewhere in viewer will be removed later.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@13017 27541ba8-7e3a-0410-8455-c3a389f83636

dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root,bbannier/ROOT,dawehner/root,bbannier/ROOT