bug symfony#58623 [Intl] do not access typed property before initialization (xabbuh)

This PR was merged into the 6.4 branch.

Discussion
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[Intl] do not access typed property before initialization

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix symfony#58600 (comment)
| License       | MIT

Commits
-------

3ca2927 do not access typed property before initialization

Author: nicolas-grekas

src/Symfony/Component/Intl/Tests/Transliterator/EmojiTransliteratorTest.php

@@ -177,4 +177,18 @@ public function testReverse()
         $this->expectException(\IntlException::class);
         EmojiTransliterator::create('emoji-en', EmojiTransliterator::REVERSE);
     }
+
+    public function testGetErrorCodeWithUninitializedTransliterator()
+    {
+        $transliterator = EmojiTransliterator::create('emoji-en');
+
+        $this->assertSame(0, $transliterator->getErrorCode());
+    }
+
+    public function testGetErrorMessageWithUninitializedTransliterator()
+    {
+        $transliterator = EmojiTransliterator::create('emoji-en');
+
+        $this->assertFalse($transliterator->getErrorMessage());
+    }
 }

src/Symfony/Component/Intl/Transliterator/EmojiTransliterator.php

@@ -72,12 +72,12 @@ public function createInverse(): self
 
         public function getErrorCode(): int|false
         {
-            return $this->transliterator?->getErrorCode() ?? 0;
+            return isset($this->transliterator) ? $this->transliterator->getErrorCode() : 0;
         }
 
         public function getErrorMessage(): string|false
         {
-            return $this->transliterator?->getErrorMessage() ?? false;
+            return isset($this->transliterator) ? $this->transliterator->getErrorMessage() : false;
         }
 
         public static function listIDs(): array