bug#15859: 24.3.50; Calc - dimensionless units again

[Michael Heerdegen]

Michael Heerdegen <michael_heerdegen@web.de> writes:

> I'm CC'ing Jay B. who seems to have worked on that code 8 years ago.
> Maybe he can hear us?

Maybe the tests whether the user specified any units are just too eager
in this case?  When I comment them out, I can input "1" or an empty
string two times and u c behaves as you want.

Michael.