[CodingStandard] Add fix for ForbiddenParentClassSniff in case of mis…

…sing parent

packages/CodingStandard/src/Sniffs/CleanCode/ForbiddenParentClassSniff.php

@@ -54,6 +54,10 @@ public function process(File $file, $position): void
         }
 
         $parentClassName = $classWrapper->getParentClassName();
+        // no parent class
+        if ($parentClassName === null) {
+            return;
+        }
 
         if ($this->shouldSkip($parentClassName)) {
             return;

packages/CodingStandard/tests/Sniffs/CleanCode/ForbiddenParentClassSniff/ForbiddenParentClassSniffTest.php

@@ -34,6 +34,7 @@ public function testCorrect(string $file): void
     public function provideCorrectCases(): Iterator
     {
         yield [__DIR__ . '/correct/correct.php.inc'];
+        yield [__DIR__ . '/correct/correct2.php.inc'];
     }
 
     protected function provideConfig(): string

packages/CodingStandard/tests/Sniffs/CleanCode/ForbiddenParentClassSniff/correct/correct.php.inc

@@ -2,10 +2,6 @@
 
 namespace SomeOtherNamespace;
 
-<<<<<<< HEAD
 class SomeClass extends SomeUnForbiddenParentClass
-=======
-class SomeClass extends SomeForbiddenParentClass
->>>>>>> ad916c1c... [CodingStandard] Add ForbiddenParentClassSniff [closes #993]
 {
 }

packages/CodingStandard/tests/Sniffs/CleanCode/ForbiddenParentClassSniff/correct/correct2.php.inc

@@ -0,0 +1,7 @@
+<?php
+
+namespace SomeOtherNamespace;
+
+class SomeClass
+{
+}