remove duplicate draft3 'required' validation in Constraints\Object

Author: alexmmm

src/JsonSchema/Constraints/Object.php

@@ -75,11 +75,6 @@ public function validateElement($element, $matches, $objectDefinition = null, $p
             $property = $this->getProperty($element, $i, new Undefined());
             $definition = $this->getProperty($objectDefinition, $i);
 
-            //required property
-            if ($this->getProperty($definition, 'required') && $property instanceof Undefined) {
-                $this->addError($path, "the property " . $i . " is required");
-            }
-
             //no additional properties allowed
             if (!in_array($i, $matches) && $additionalProp === false && $this->inlineSchemaProperty !== $i && !$definition) {
                 $this->addError($path, "The property " . $i . " is not defined and the definition does not allow additional properties");