Easy way to make it so Nan and Infinity don't show up

[TechSavvySam]

Is there a field property to have the resulting value be the empty string when an expression evaluates to NaN or Infinity?

I know how to work around this by using a string property that formats the value for me, but I was wondering if there was a code-less way.

Thanks

[TechSavvySam]

Here's the annoying way to do it:

=IIF(Fields.Posts=0,'',CDbl(Sum(Fields.TotalMs))/ CDbl(Sum(Fields.Posts)))