bug symfony#60724 [VarDumper] Fix dumping LazyObjectState when using VarExporter v8 (nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
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[VarDumper] Fix dumping LazyObjectState when using VarExporter v8

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

Commits
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56554c2 [VarDumper] Fix dumping LazyObjectState when using VarExporter v8

Author: nicolas-grekas

src/Symfony/Component/VarDumper/Caster/SymfonyCaster.php

@@ -90,12 +90,14 @@ public static function castLazyObjectState($state, array $a, Stub $stub, bool $i
 
         $instance = $a['realInstance'] ?? null;
 
-        $a = ['status' => new ConstStub(match ($a['status']) {
-            LazyObjectState::STATUS_INITIALIZED_FULL => 'INITIALIZED_FULL',
-            LazyObjectState::STATUS_INITIALIZED_PARTIAL => 'INITIALIZED_PARTIAL',
-            LazyObjectState::STATUS_UNINITIALIZED_FULL => 'UNINITIALIZED_FULL',
-            LazyObjectState::STATUS_UNINITIALIZED_PARTIAL => 'UNINITIALIZED_PARTIAL',
-        }, $a['status'])];
+        if (isset($a['status'])) { // forward-compat with Symfony 8
+            $a = ['status' => new ConstStub(match ($a['status']) {
+                LazyObjectState::STATUS_INITIALIZED_FULL => 'INITIALIZED_FULL',
+                LazyObjectState::STATUS_INITIALIZED_PARTIAL => 'INITIALIZED_PARTIAL',
+                LazyObjectState::STATUS_UNINITIALIZED_FULL => 'UNINITIALIZED_FULL',
+                LazyObjectState::STATUS_UNINITIALIZED_PARTIAL => 'UNINITIALIZED_PARTIAL',
+            }, $a['status'])];
+        }
 
         if ($instance) {
             $a['realInstance'] = $instance;