NPE fix for Relation

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35814 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#4208 hiding toolbar elements from release - fixed

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@35815 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e