Steps to simulate:

> Launch gnome-search tool

> Enter a '*' into the "Name contains" combobox and press <Return>
   - Press <tab> six times and focus is on the first entry of the
     search results table.

Bug: 
To select the first item, user has to press <Down> which will
select the second item and then press <Up> arrow key to select first item.

Note:  When we enter name into the "Name contains" combobox that will
only produce one result and then tab in to the tree view, user is able
to select the only item by pressing <up> or <down> key.

Expected Behaviour:
If there is no selection in the treeview and a node has focus, then Up/Down
keypress should select the focussed node. Subsequent Up/Down keypress should
allow user to traverse through the list.