Handle upgrade of old text widgets. Props Denis-de-Bernardy. fixes #9608

git-svn-id: https://develop.svn.wordpress.org/trunk@11030 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/widgets.php

@@ -962,6 +962,8 @@ function wp_convert_widget_settings($base_name, $option_name, $settings) {
 	if ( empty($settings) ) {
 		$single = true;
 	} else {
+		if ( isset($settings['number']) )
+			unset($settings['number']);
 		foreach ( array_keys($settings) as $number ) {
 			if ( !is_numeric($number) ) {
 				$single = true;