update the route name to the route key if the key is a string

Author: dbu

NestedMatcher/ConfigurableUrlMatcher.php

@@ -47,7 +47,7 @@ public function finalMatch(RouteCollection $collection, Request $request)
                 $name = $route->getRouteKey();
             }
 
-            if (empty($attributes[RouteObjectInterface::ROUTE_NAME]) && is_string($name)) {
+            if (is_string($name)) {
                 $attributes[RouteObjectInterface::ROUTE_NAME] = $name;
             }
         }