[Zope] lists

[D. Rick Anderson]

I have a group of checkboxes on a site that I want to parse into an 
email. I've been trying to use dtml-in to iterate through the checked 
boxes, but if they only check one box then it's not a list anymore and 
dtml-in barfs. Is the only solution to trap an error and render it as a 
var in the except?  like this:

<dtml-try>
  <dtml-in checkbox>
    <dtml-var sequence-item>
  </dtml-in>
<dtml-except>
  <dtml-var checkbox>
</dtml-try>

or is there a more elegant way to do this?

TIA

Rick