Fixed empty(trim)) error in versions prior to php 5.5

diff --git a/purchasing/po_entry_items.php b/purchasing/po_entry_items.php
index a4afb367dce2194cc7c1b7e12c243770ec64ed1d..3a898d3da38432d8a78d570318f0ca2120f96cf1 100644 (file)
--- a/purchasing/po_entry_items.php
+++ b/purchasing/po_entry_items.php
@@ -360,7 +360,7 @@ function can_commit()
        }
        }
 
-       if ($_SESSION['PO']->trans_type == ST_SUPPINVOICE && empty(trim(get_post('supp_ref'))))
+       if ($_SESSION['PO']->trans_type == ST_SUPPINVOICE && trim(get_post('supp_ref')) == false)
        {
                display_error(_("You must enter a supplier's invoice reference."));
                set_focus('supp_ref');