TOPIC: option to display text in email message

I have check boxes in the form. If they check then then the field shows "yes" otherwise it is blank

In the email message output I have the fields label then the field value eg
Workshop:
RANZCOG_Fetal_Surveillance:
Vacuum_Assisted:
Communication_strategies:
Social_Communication:
Birth_Places: Yes
Motivational_Interviewing:
Antenatal_Care:

The user only selected the Birth_places check box so that is fine but I actually don't want to show the other field labels as they were not selected. Is there a "if" function tag facility in your message builder.
eg {if [field_x]!="" then}
xxxxx
{endif}

Any update on this