Ticket #4799: as far as Eclipse can tell me, this is a perfect fix for CTRL-G for the current state of the Trunk

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38037 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #4799: maybe this correction to my previous commit makes it still more perfect

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38038 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ensure only one input bar is present, unrelated NPE

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38039 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e