Show thumb from inside file in 3D when no WebGL is present

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34226 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Make sure 3D macros do not kill GeoGebra (no 3D) on start

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34227 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e