[PropertyInfo] Fix PhpStanExtractor when constructor has no docblock

Extractor/PhpStanExtractor.php

@@ -171,7 +171,10 @@ private function getDocBlockFromConstructor(string $class, string $property): ?P
             return null;
         }
 
-        $rawDocNode = $reflectionConstructor->getDocComment();
+        if (!$rawDocNode = $reflectionConstructor->getDocComment()) {
+            return null;
+        }
+
         $tokens = new TokenIterator($this->lexer->tokenize($rawDocNode));
         $phpDocNode = $this->phpDocParser->parse($tokens);
         $tokens->consumeTokenType(Lexer::TOKEN_END);

Tests/Extractor/PhpStanExtractorTest.php

@@ -14,6 +14,7 @@
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\PropertyInfo\Extractor\PhpDocExtractor;
 use Symfony\Component\PropertyInfo\Extractor\PhpStanExtractor;
+use Symfony\Component\PropertyInfo\Tests\Fixtures\ConstructorDummyWithoutDocBlock;
 use Symfony\Component\PropertyInfo\Tests\Fixtures\DefaultValue;
 use Symfony\Component\PropertyInfo\Tests\Fixtures\Dummy;
 use Symfony\Component\PropertyInfo\Tests\Fixtures\ParentDummy;
@@ -353,6 +354,14 @@ public function testExtractConstructorTypes($property, array $type = null)
         $this->assertEquals($type, $this->extractor->getTypesFromConstructor('Symfony\Component\PropertyInfo\Tests\Fixtures\ConstructorDummy', $property));
     }
 
+    /**
+     * @dataProvider constructorTypesProvider
+     */
+    public function testExtractConstructorTypesReturnNullOnEmptyDocBlock($property)
+    {
+        $this->assertNull($this->extractor->getTypesFromConstructor(ConstructorDummyWithoutDocBlock::class, $property));
+    }
+
     public static function constructorTypesProvider()
     {
         return [

Tests/Fixtures/ConstructorDummyWithoutDocBlock.php

@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\PropertyInfo\Tests\Fixtures;
+
+class ConstructorDummyWithoutDocBlock
+{
+    public function __construct(\DateTimeZone $timezone, $date, $dateObject, \DateTimeImmutable $dateTime, $mixed)
+    {
+    }
+}