Fix AddGenericReturnTypeToRelationsRector on Rector 0.15.2 (#74)

Fix AddGenericReturnTypeToRelationsRector on Rector 0.15.2

On Rector 0.15.2 the test failed to run for no-phpdoc.php.inc.
This fix supports both 0.14.x and 0.15.x

It failed because of this change: rectorphp/rector-src@96c457b#diff-d12d9867614cdc1cab5c7942a80cafabd78d8e027d227f9ba1bc8ffeb6643f61L70

Author: rene-bos

src/Rector/ClassMethod/AddGenericReturnTypeToRelationsRector.php

@@ -16,7 +16,6 @@
 use PHPStan\Type\Constant\ConstantStringType;
 use PHPStan\Type\Generic\GenericClassStringType;
 use PHPStan\Type\ObjectType;
-use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfo;
 use Rector\BetterPhpDocParser\ValueObject\Type\FullyQualifiedIdentifierTypeNode;
 use Rector\Core\Rector\AbstractRector;
 use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
@@ -101,10 +100,7 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
-        $phpDocInfo = $this->phpDocInfoFactory->createFromNode($node);
-        if (! $phpDocInfo instanceof PhpDocInfo) {
-            return null;
-        }
+        $phpDocInfo = $this->phpDocInfoFactory->createFromNodeOrEmpty($node);
 
         // Return, if already has return type
         if ($node->getDocComment() !== null && $phpDocInfo->hasByName('return')) {