fix #1958

Signed-off-by: dartcafe <github@dartcafe.de>

lib/Migration/TableSchema.php

@@ -207,7 +207,7 @@ abstract class TableSchema {
 			'allow_proposals' => ['type' => Types::STRING, 'options' => ['notnull' => true, 'default' => 'disallow', 'length' => 64]],
 			'use_no' => ['type' => Types::INTEGER, 'options' => ['notnull' => true, 'default' => 1]],
 			'proposals_expire' => ['type' => Types::INTEGER, 'options' => ['notnull' => true, 'default' => 0]],
-			'misc_settings' => ['type' => Types::TEXT, 'options' => ['notnull' => true, 'default' => '', 'length' => 65535]],
+			'misc_settings' => ['type' => Types::TEXT, 'options' => ['notnull' => false, 'default' => '', 'length' => 65535]],
 		],
 		Option::TABLE => [
 			'id' => ['type' => Types::INTEGER, 'options' => ['autoincrement' => true, 'notnull' => true]],