[turba] empty searches won't return all contacts while browse = true

[Nethub Online]

Hi all,

In the backends.php, I found this:
browse: (boolean) If true, this source will be browseable via the Browse
        menu item, and empty searches against the source will return all
        contacts.

and by default it is using localsql and 'browse' => true , however I search
with nothing in the search field and press "Search", there is nothing shown.

While I search using a non exist keyword, it will show:
------------------------------------
Basic Search
Contacts displayed: None

No matching contacts
------------------------------------

While I search using a space " ", it can return all contacts successfully.

I believe "empty searches against the source will return all contacts." is
not working (even "No matching contacts" is not shown), does anyone know how
to fix it?

Nethub Online Limited
http://www.nethub.com.hk