Fix: [ bug #991 ] Error when adding a product in POS when no Tax is

associated to the country of the company

htdocs/core/lib/price.lib.php

@@ -69,6 +69,9 @@ function calcul_price_total($qty, $pu, $remise_percent_ligne, $txtva, $uselocalt
 
 	$result=array();
 
+	// Clean parameters
+	if (empty($txtva)) $txtva=0;
+	
 	if (empty($seller) || ! is_object($seller))
 	{
 		if (! is_object($mysoc))	// mysoc may be not defined (during migration process)