Merge pull request #1470 from tiaris/develop

correction erreur sql update url = null

htdocs/product/class/product.class.php

@@ -610,7 +610,7 @@ class Product extends CommonObject
 			$sql.= ", volume_units = " . ($this->volume_units!='' ? "'".$this->volume_units."'" : 'null');
 			$sql.= ", seuil_stock_alerte = " . ((isset($this->seuil_stock_alerte) && $this->seuil_stock_alerte != '') ? "'".$this->seuil_stock_alerte."'" : "null");
 			$sql.= ", description = '" . $this->db->escape($this->description) ."'";
-			$sql.= ", url = " . ($this->url?"'".$this->db->escape($this->url)."'":'');
+			$sql.= ", url = " . ($this->url?"'".$this->db->escape($this->url)."'":'null');
 			$sql.= ", customcode = '" .        $this->db->escape($this->customcode) ."'";
 	        $sql.= ", fk_country = " . ($this->country_id > 0 ? $this->country_id : 'null');
 	        $sql.= ", note = '" .        $this->db->escape($this->note) ."'";