deleteMembership fails if hard coded activity types are not present

The deleteMembership function in CRM/Member/BAO/Membership.php has several Hard Coded activities types. If any of those activity types are not present then the delete fails.

Starting at (or about) line 580 the following change/patch eliminates that problem.

$params = array(
'source_record_id' => $membershipId,
'activity_type_id' => array(), // Removed Hard Coded Activity Types
);

$membershipActivities = array('Membership Signup','Membership Renewal','Change Membership Status','Change Membership Type','Membership Renewal Reminder');
foreach($membershipActivities AS $memAct)
{
$tId = array_search($memAct, $activityTypes);
if($tId !== false)

{ $params["activity_type_id"][] = $tId; }

}

Sorry it's not really up to snuff... but it's a small snippet so I hope you'll forgive me.