Fix feed title option (#6771)

fix https://github.com/FreshRSS/FreshRSS/issues/6756

app/Controllers/configureController.php

@@ -114,17 +114,17 @@ class FreshRSS_configure_Controller extends FreshRSS_ActionController {
 	public function readingAction(): void {
 		if (Minz_Request::isPost()) {
 			FreshRSS_Context::userConf()->posts_per_page = Minz_Request::paramInt('posts_per_page') ?: 10;
-			FreshRSS_Context::userConf()->view_mode = Minz_Request::paramString('view_mode', true) ?: 'normal';
-			FreshRSS_Context::userConf()->default_view = Minz_Request::paramString('default_view') ?: 'adaptive';
+			FreshRSS_Context::userConf()->view_mode = Minz_Request::paramStringNull('view_mode', true) ?? 'normal';
+			FreshRSS_Context::userConf()->default_view = Minz_Request::paramStringNull('default_view') ?? 'adaptive';
 			FreshRSS_Context::userConf()->show_fav_unread = Minz_Request::paramBoolean('show_fav_unread');
 			FreshRSS_Context::userConf()->auto_load_more = Minz_Request::paramBoolean('auto_load_more');
 			FreshRSS_Context::userConf()->display_posts = Minz_Request::paramBoolean('display_posts');
-			FreshRSS_Context::userConf()->display_categories = Minz_Request::paramString('display_categories') ?: 'active';
-			FreshRSS_Context::userConf()->show_tags = Minz_Request::paramString('show_tags') ?: '0';
+			FreshRSS_Context::userConf()->display_categories = Minz_Request::paramStringNull('display_categories') ?? 'active';
+			FreshRSS_Context::userConf()->show_tags = Minz_Request::paramStringNull('show_tags') ?? '0';
 			FreshRSS_Context::userConf()->show_tags_max = Minz_Request::paramInt('show_tags_max');
-			FreshRSS_Context::userConf()->show_author_date = Minz_Request::paramString('show_author_date') ?: '0';
-			FreshRSS_Context::userConf()->show_feed_name = Minz_Request::paramString('show_feed_name') ?: 't';
-			FreshRSS_Context::userConf()->show_article_icons = Minz_Request::paramString('show_article_icons') ?: 't';
+			FreshRSS_Context::userConf()->show_author_date = Minz_Request::paramStringNull('show_author_date') ?? '0';
+			FreshRSS_Context::userConf()->show_feed_name = Minz_Request::paramStringNull('show_feed_name') ?? 't';
+			FreshRSS_Context::userConf()->show_article_icons = Minz_Request::paramStringNull('show_article_icons') ?? 't';
 			FreshRSS_Context::userConf()->hide_read_feeds = Minz_Request::paramBoolean('hide_read_feeds');
 			FreshRSS_Context::userConf()->onread_jump_next = Minz_Request::paramBoolean('onread_jump_next');
 			FreshRSS_Context::userConf()->lazyload = Minz_Request::paramBoolean('lazyload');

lib/Minz/Request.php

@@ -106,7 +106,7 @@ class Minz_Request {
 		return 0;
 	}
 
-	public static function paramString(string $key, bool $specialchars = false): string {
+	public static function paramStringNull(string $key, bool $specialchars = false): ?string {
 		if (isset(self::$params[$key])) {
 			$s = self::$params[$key];
 			if (is_string($s)) {
@@ -117,7 +117,11 @@ class Minz_Request {
 				return (string)$s;
 			}
 		}
-		return '';
+		return null;
+	}
+
+	public static function paramString(string $key, bool $specialchars = false): string {
+		return self::paramStringNull($key, $specialchars) ?? '';
 	}
 
 	/**