Conditional Show in Custom Query

I've had a look on here and haven't found anything that helps (consequence of there being too many post and no tagging mechanism)

I am trying to use a custom query to show addresses but not show empty lines, what is the correct syntax (SHOW SECTION_START generates errors).

Syntax is like below;

# if(data["myattribute"] != null) { #
<span style="color:red">{myattribute}</span>
# } #