Binding::getExistingBindings

protected function getExistingBindings(int $activityId): ?array
{

	$bindings = $this->activityEntity::GetBindings($activityId);
	if ($this->activityEntity::GetErrorCount())
	{
		$this->addError(new Error(
			$this->activityEntity::GetLastErrorMessage()
		));

		return null;
	}
	if (!is_array($bindings))
	{
		return null;
	}

	return $bindings;
}