[Php71] Remove direct return STOP_TRAVERSAL on CountOnNullRector (#4189)

Co-authored-by: GitHub Action <actions@github.com>

rules/Php71/Rector/FuncCall/CountOnNullRector.php

@@ -17,7 +17,6 @@
 use PhpParser\Node\Name;
 use PhpParser\Node\Name\FullyQualified;
 use PhpParser\Node\Scalar\LNumber;
-use PhpParser\Node\Stmt\Trait_;
 use PhpParser\NodeTraverser;
 use PHPStan\Analyser\Scope;
 use PHPStan\Type\ArrayType;
@@ -78,19 +77,14 @@ public function getRuleDefinition(): RuleDefinition
      */
     public function getNodeTypes(): array
     {
-        return [Trait_::class, FuncCall::class, Ternary::class];
+        return [FuncCall::class, Ternary::class];
     }
 
     /**
-     * @param Trait_|FuncCall|Ternary $node
+     * @param FuncCall|Ternary $node
      */
     public function refactorWithScope(Node $node, Scope $scope): int|Ternary|null|FuncCall
     {
-        if ($node instanceof Trait_) {
-            // skip contents in traits, as hard to analyze
-            return NodeTraverser::STOP_TRAVERSAL;
-        }
-
         if ($node instanceof Ternary) {
             if ($this->shouldSkipTernaryIfElseCountFuncCall($node)) {
                 return NodeTraverser::DONT_TRAVERSE_CHILDREN;