How To Eliminate A Comma In Name Fields / If Field Has Only One Name

I am using Access 2013 and have created a music inventory database.I have a question about formatting some text in a table. One of my tables has the following fields:

tblArtist
Artist ID
DVD Number
Artist Last Name
Artist First Name
Artist Full Name

In my form, I want the artist's name to appear like this:

Mozart, Wolfgang
Dylan, Bob
Beatles
Aerosmith

I know how to format the table to do this, and I know how to construct the form for this. To format the name, in the tblArtist table, I use the following expression in the Artist Full Name field:[Artist Last Name] & ", " & [Artist First Name]

If an artist has only one name, such as Aerosmith, I enter it in the Artist Last Name column. Artists such as The Beatles or The Rolling Stones, I just omit "The."When a one-name artist's full name appears in the form, there is a comma after their name.

Is there a simple way to eliminate the comma if there is no text in the Artist First Name column? If so, what is the simplest, easiest, most practical novice-friendly way to do this?