minor symfony#23803 [HttpKernel] Remove isset call used for legacy (ogizanagi)

This PR was merged into the 3.3 branch.

Discussion
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[HttpKernel] Remove isset call used for legacy

| Q             | A
| ------------- | ---
| Branch?       | 3.3 <!-- see comment below -->
| Bug fix?      | no
| New feature?  | no <!-- don't forget updating src/**/CHANGELOG.md files -->
| BC breaks?    | no
| Deprecations? | no <!-- don't forget updating UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets | N/A <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | N/A

Added in symfony#9628 in which the request stack dependency was nullable. Forgotten to be removed in symfony#14634.

Commits
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e0a6010 [HttpKernel] Remove isset call used for legacy

Author: nicolas-grekas

src/Symfony/Component/HttpKernel/EventListener/ProfilerListener.php

@@ -107,8 +107,7 @@ public function onKernelTerminate(PostResponseEvent $event)
     {
         // attach children to parents
         foreach ($this->profiles as $request) {
-            // isset call should be removed when requestStack is required
-            if (isset($this->parents[$request]) && null !== $parentRequest = $this->parents[$request]) {
+            if (null !== $parentRequest = $this->parents[$request]) {
                 if (isset($this->profiles[$parentRequest])) {
                     $this->profiles[$parentRequest]->addChild($this->profiles[$request]);
                 }