fix(doctrine): OrderFilterTrait - properties null value causing error in foreach

Author: thatsLegit

src/Doctrine/Common/Filter/OrderFilterTrait.php

@@ -43,7 +43,7 @@ public function getDescription(string $resourceClass): array
             $properties = array_fill_keys($fieldNames, null);
         }
 
-        foreach ($properties as $property => $propertyOptions) {
+        foreach ($properties ?? [] as $property => $propertyOptions) {
             if (!$this->isPropertyMapped($property, $resourceClass)) {
                 continue;
             }