Check if there are points when update region coord sys

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37927 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Don't check if the var itself is undefined (maybe undefined at last compute)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@37928 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e