Merge branch 'stable-3.0.5' of git.ispconfig.org:ispconfig/ispconfig3 into stable-3.0.5

Author: Till Brehm

interface/lib/classes/tform_tpl_generator.inc.php

@@ -268,7 +268,7 @@ function buildHTML($formDef, $tab) {
 					case 'TEXT':
 						$type = 'text';
 						$typevalue = '';
-						$defaultValue = 'NULL';
+						$defaultValue = NULL;
 						break;
 					case 'DATE':
 						$type = 'date';