#3403 null pointer exception after File -> New Window (needs ggb42 backport)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26048 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3403 kernel shouldn't be static [needs ggb42 backport]

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26049 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e