Merge branch '4.1'

* 4.1:
  [DependencyInjection] Fix tags on multiple decorated service
  fix merge
  SCA: reverted code style changes
  SCA: reverted code style changes
  SCA: applied requested code style changes
  SCA: simplify some ifs in favour of null coalescing operator

Author: nicolas-grekas

Generator/UrlGenerator.php

@@ -262,10 +262,7 @@ protected function doGenerate($variables, $defaults, $requirements, $tokens, $pa
         });
 
         // extract fragment
-        $fragment = '';
-        if (isset($defaults['_fragment'])) {
-            $fragment = $defaults['_fragment'];
-        }
+        $fragment = $defaults['_fragment'] ?? '';
 
         if (isset($extra['_fragment'])) {
             $fragment = $extra['_fragment'];