[Bug]: Attempt to read property "value" on null in Merge.php (#622)

* [Bug]: Attempt to read property "value" on null in Merge.php

* Apply php-cs-fixer changes

Co-authored-by: mcop1 <[email protected]>

Author: mcop1

src/GraphQL/Query/Operator/Merge.php

@@ -43,6 +43,9 @@ public function getLabeledValue($element, ResolveInfo $resolveInfo = null)
             $valueResolver = $this->getGraphQlService()->buildValueResolverFromAttributes($c);
 
             $childResult = $valueResolver->getLabeledValue($element, $resolveInfo);
+            if ($childResult === null) {
+                continue;
+            }
             $childValues = $childResult->value;
 
             if ($this->flatten) {