JiraRestApi\Issue\Reporter::jsonSerialize PHP Method

    public function jsonSerialize()
    {
        $vars = get_object_vars($this);
        foreach ($vars as $key => $value) {
            if ($key === 'name' && !is_null($value)) {
                continue;
            } elseif (is_null($value) || $value === '') {
                unset($vars[$key]);
            }
        }
        if (empty($vars)) {
            return;
        }
        return $vars;
    }

 /**
  * @see https://github.com/lesstif/php-jira-rest-client/issues/18
  */
 public function testEmptyAssignee()
 {
     $r = new Reporter();
     $r->name = '';
     $r->emailAddress = '*****@*****.**';
     $r->avatarUrls = '';
     $d = $r->jsonSerialize();
     //  passing a name value of '' then serialized array has 'name' key and empty value.
     $this->assertEquals(true, array_key_exists('name', $d), 'Can\'t found "name" key.');
     $this->assertEquals(false, array_key_exists('avatarUrls', $d));
 }