Account for $nav_bg not being set in frio/php/default

- Address https://github.com/friendica/friendica/issues/8877#issuecomment-677319560

diff --git a/view/theme/frio/php/default.php b/view/theme/frio/php/default.php
index ca661c2830f227186d4f5d4ed29befcf6ce83562..949417ccf292a73eff9fbad18c3d16002f36ac4b 100644 (file)
--- a/view/theme/frio/php/default.php
+++ b/view/theme/frio/php/default.php
@@ -71,7 +71,7 @@ $is_singleuser_class = $is_singleuser ? "is-singleuser" : "is-not-singleuser";
                        }
                }
 
-               $nav_bg = $nav_bg ?: DI::pConfig()->get($uid, 'frio', 'nav_bg', DI::config()->get('frio', 'nav_bg', '#708fa0'));
+               $nav_bg = $nav_bg ?? DI::pConfig()->get($uid, 'frio', 'nav_bg', DI::config()->get('frio', 'nav_bg', '#708fa0'));
 
                echo '<meta name="theme-color" content="' . $nav_bg . '" />';
 ?>