Fix login is a mandatory field.

htdocs/user/class/user.class.php

@@ -807,9 +807,9 @@ class User extends CommonObject
 	/**
 	 *  Create a user into database
 	 *
-	 *  @param	User	$user        	Objet user qui demande la creation
-	 *  @param  int		$notrigger		1 ne declenche pas les triggers, 0 sinon
-	 *  @return int			         	<0 si KO, id compte cree si OK
+	 *  @param	User	$user        	Objet user doing creation
+	 *  @param  int		$notrigger		1=do not execute triggers, 0 otherwise
+	 *  @return int			         	<0 if KO, id of created user if OK
 	 */
 	function create($user,$notrigger=0)
 	{
@@ -829,6 +829,12 @@ class User extends CommonObject
 			$this->error = $langs->trans("ErrorBadEMail",$this->email);
 			return -1;
 		}
+		if (empty($this->login))
+		{
+			$langs->load("errors");
+			$this->error = $langs->trans("ErrorFieldRequired",$this->login);
+			return -1;
+		}
 
 		$this->datec = dol_now();
 
@@ -1171,7 +1177,13 @@ class User extends CommonObject
 			$this->error = $langs->trans("ErrorBadEMail",$this->email);
 			return -1;
 		}
-
+		if (empty($this->login))
+		{
+			$langs->load("errors");
+			$this->error = $langs->trans("ErrorFieldRequired",$this->login);
+			return -1;
+		}
+		
 		$this->db->begin();
 
 		// Update datas