@Greg68
Without knowing your formula you are using, you can simply supply a Default to the Switch function.
The very last parameter to Switch is the Default/Else of the statement.
Ex.
Switch(Self.Text,
"Something", Red,
"Big", Yellow,
"Hi", Black,
Green
)
In this case, Green is the color that will be returned because nothing matched. In your case, the blank would fall into that scenario.
I hope this is helpful for you.