Merge remote-tracking branch 'origin/3.8' into develop

# Conflicts:
#	htdocs/printing/admin/printing.php

htdocs/printing/admin/printing.php

@@ -229,7 +229,7 @@ if ($mode == 'test' && $user->admin)
         $langs->load($driver);
         $printer = new $classname($db);
         //print '<pre>'.print_r($printer, true).'</pre>';
-        if ($printer->getlist_available_printers) {
+        if (count($printer->getlist_available_printers)) {
             print $printer->listAvailablePrinters();
         }
         else {