Fix: if option to select thirdparties using a combo box after n chars

was on, it was no more possible to clear the filter.

htdocs/core/class/html.form.class.php

@@ -1016,6 +1016,7 @@ class Form
             // Do not use textempty = ' ' or ' ' here, or search on key will search on ' key'.
             //$textifempty=' ';
             //if (! empty($conf->use_javascript_ajax) || $forcecombo) $textifempty='';
+            if (! empty($conf->global->COMPANY_USE_SEARCH_TO_SELECT)) $textifempty.=$langs->trans("NoFilter");
             if ($showempty) $out.= '<option value="-1">'.$textifempty.'</option>'."\n";
 
             $num = $this->db->num_rows($resql);

htdocs/langs/en_US/main.lang

@@ -106,6 +106,7 @@ NotePrivate=Note (private)
 PrecisionUnitIsLimitedToXDecimals=Dolibarr was setup to limit precision of unit prices to <b>%s</b> decimals.
 DoTest=Test
 ToFilter=Filter
+NoFilter=No filter
 WarningYouHaveAtLeastOneTaskLate=Warning, you have at least one element that has exceeded the tolerance delay.
 yes=yes
 Yes=Yes