Data Merge - How to remove blank lines?

The way to remove a blank line from a data merge is usually to click the "remove blank lines for empty fields" checkbox in the content placement options document panel.

However, the line isn't truly blank: it has the words Fax(tab) in the line, so this checkbox won't work in this instance.

I'd recommend processing the document and getting rid of the blank fax lines once the merge has finished by doing a GREP change for ^Fax.\t$ and removing those entries.

Because data merge is in my opinion best at one page/one record entries, it isn't great at catalogues. Without getting a catalogue plugin, I have a video that shows workarounds to get the data merge text all into one frame: https://youtu.be/kTcvNQTYgrA

A more dangerous way is to make a numbered style as shown below and apply it to the line.

The danger is when the line is blank AND the preview box is checked on, because the line below will now be given the fax formatting.

My fellow ACP Eugene has written a further workaround to this that is worth reading: https://indesignsecrets.com/data-merge-remove-unwanted-lines.php and I too have written an earlier article about this behaviour: https://colecandoo.com/2012/08/10/no-fills-grep-styles-part-2-the-glitch-of-the-merge/