Broken link for updateSubscriptionUrl

$updateSubscriptionBillingUrl is a URL provided by some payment processors not others.

To prevent messages with broken links going out the default templates should enclose this link html in an

{if}

statement. When not available

{if $updateSubscriptionBillingUrl}

would work fine as NULL is assigned

<td colspan="2" {$labelStyle}>

{ts 1=$updateSubscriptionBillingUrl}

You can update billing details for this recurring contribution by <a href="%1">visiting this web page</a>.

{/ts}

</td>