Suppress content that contains empty tag results (email notifications)

Ability to hide content if the included tag returns empty. Example: there are 3 address fields available to customers, which few need. It would improve the presentation of emails if you could suppress the entire line for ##CUST_ADDRESS2## and ##CUST_ADDRESS3## if they will be empty, like this:

123 Main Street

Anytown, DE 01234

rather than:

123 Main Street

(empty line)

(empty line)

Anytown, DE 01234

Below is example syntax:

##CUST_ADDRESS1##<br />

[[##CUST_ADDRESS2##<br />]]

[[##CUST_ADDRESS3##<br />]]

##CUST_CITY##, ##CUST_STATE## ##CUST_POSTAL##<br />

If the tag ##CUST_ADDRESS2## returns empty, then the entire contents between the enclosing double brackets are suppressed. In this case, "<br />" is also suppressed so that there is no blank line.