Fixed redirects using wrong redirect code

CHANGELOG.md

@@ -16,6 +16,7 @@
     * Fixed `Flex Page` CRUD ACL when creating a new page (needs Flex Objects plugin update) [grav-plugin-flex-objects#115](https://github.com/trilbymedia/grav-plugin-flex-objects/issues/115)
     * Fixed the list of pages not showing up in admin [#3280](https://github.com/getgrav/grav/issues/3280)
     * Fixed text field min/max validation for UTF8 characters [#3281](https://github.com/getgrav/grav/issues/3281)
+    * Fixed redirects using wrong redirect code
 
 # v1.7.8
 ## 03/17/2021

system/src/Grav/Common/Grav.php

@@ -426,7 +426,7 @@ class Grav extends Container
         // Clean route for redirect
         $route = preg_replace("#^\/[\\\/]+\/#", '/', $route);
 
-        if (null !== $code || $code < 300 || $code > 399) {
+        if ($code < 300 || $code > 399) {
             $code = null;
         }