#3392 Double conversion of null bug is solved.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34285 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
4.9.270.0

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34286 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e