Fixed some warnings

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30007 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fixed NPE when customizing toolbar

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30008 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
#3775 simple applets width height can be changed on demand

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30009 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e