Thanks Tres, Sascha and Jirka for your help.
I used the following and it works great (without some formatting for
clarity):
<tr tal:define="customer container/getCustomerLicences"
tal:condition="customer">
<td>Customer: <span
tal:content="python:customer[0]['full_name']"></span></td>
</tr>
The above condition checks that 'customer' is not empty.
I think I'll need to do some more reading up on "path expressions" and
"python expressions". Still mentally confusing to me.
Julian
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