[Bug 217273] Improve error messages if not "one and only one option" selected

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217273

            Bug ID: 217273
           Summary: Improve error messages if not "one and only one
                    option" selected
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: andreas.sommer87 at googlemail.com
                CC: freebsd-ports-bugs at FreeBSD.org

Created attachment 180187
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180187&action=edit
Patch to distinguish with separate error messages

While playing around with port options, specifically a "single" (only allows a
single option), I was getting errors and was unsure if the options I set were
actually applied correctly. Long story short: I had to figure out if the error
"You must select one and only one option from the ${single} single" meant that
1) I have not chosen any option or 2) I have chosen more than one.

Hence I propose the attached patch to help beginners (like me) by clearly
distinguishing those two error cases with separate error messages.

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