Delete session sort when sort column is not defined, closes #279, closes #281
Delete session sort when sort column is not defined, closes #279, closes #281

Attanon/datagrid,harmim/datagrid,chapcz/datagrid,Attanon/datagrid,harmim/datagrid,ublaboo/datagrid,chapcz/datagrid,Attanon/datagrid,ublaboo/datagrid