Base, Report-builder: suppress blank lines

Addressing envelopes from a contacts database with required and optional fields.

How to build a report that suppresses blank lines for optional fields.
e.g if an Addr2 field ISBLANK the report should not insert a blank line.

Is there a solution using Conditional Print Expression?

Conditional Print Expression - Help Button - leads to a stub.

I think you can find help in this thread.

Solveig’s blog from 2007 describes an inconvenient work around for Writer, and Mail Merge.

Please point to a simple 2013 description of the work around for Base Report Builder.
There may be a way of using conditional groups in Base but the Builder GUI is inscrutable and a search of likely keywords finds nothing in the help documentation.