How to add conditions to mail content

[onlinesun]

In my bpmn.xml file, I'm trying to send out email once a form is submitted, it works fine with one issue: sometimes there are empty fields in the form, and I don't want to send them out, is there any way to add conditions to the mail content?
<activiti:field name="html">
&lt;activiti:expression><![CDATA[

&lt;html>
&lt;body>
&lt;table>&lt;tr>&lt;th>Course&lt;/th>&lt;th>Credits&lt;/th>&lt;/tr>
&lt;tr>&lt;td>${Course1}&lt;/td>&lt;td>${Credit1}&lt;/td>&lt;/tr>

Is there a way to say
if${Course2}!='' then
&lt;tr>&lt;td>${Course2}&lt;/td>&lt;td>${Credit2}&lt;/td>&lt;/tr>

[frederikherema1]

The email-templating is done using JUEL, which has a limited amount of support for this kind of stuff. If you want to have complex templating, you might consider using another approach, eg. a custom ServiceTask which uses Freemarker and passed in all the process-variables as model. Using field-injection (see userguide), you can reuse this custom mail-task in your processes.

[onlinesun]

Thanks, I showed my client your post, and they decided a snapshot of form is good enough.