Unless you've changed the defaults, an 'empty' text formfield will have
exactly 5
spaces - it cannot have 6 or more characters. Hence, to test whether a text formfield is 'empty', you'd use:
Code:
Field is {IF{REF textFormFieldName}<> " " "not "}empty
Of course, then you have the problem of what to do if the user has simply pressed the spacebar one or more times and ended up with anything other than 5 spaces (e.g. 100) in the formfield...