Conditional formatting from List and no blank cells

Hi all,
I'm trying to acheive Data Validation from a named range (ListName) along with not allowing empty/blank cells.
Cells in the spreadsheet by default consists of information alternative a hyphen (-) which is part of a List of items that are allowed.
But if someone deletes the content in a cell I need them to choose at least "-" if not one of the other allowed items in the list.

Initially I had the following as Data Validation:
=ListName

I found a thread which should force content in a cell (blanks not allowed):
=COUNTIF($B7:$NH200, "")=0

But I haven't been able to work out if it's possible to combine the two.

Hope it all makes sense.

Thanks in advance for any ideas.

Not really clear what you need. It might be as simple as unticking "ignore blank" in Data Validation. If not, then I need more info.

Thanks for your responses. I tried uploading a sample file both in Safari and Chrome but the attachment tool won't load in either.

Thanks any way.