Refactoring towards 3D in tablet apps: NPE

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37463 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
More NPEs, switched Tablet to use 3D

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37464 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e