[Bug 223555] apropos does not report failed keyword searches

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223555

            Bug ID: 223555
           Summary: apropos does not report failed keyword searches
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: wosch at FreeBSD.org

I searched for 2 keywords. On FreeBSD 10 I get:

$ env PAGER=cat apropos foobar c89
c(7), c78(7), c89(7), c90(7), c99(7) - The C programming language
c89(1)                   - POSIX.2 C language compiler
foobar: nothing appropriate

On FreeBSD 12-current
$ env PAGER=cat apropos foobar c89
c89(1) - POSIX.2 C language compiler
c99, c, c78, c89, c90, c,, c78,, c89,, c90,(7) - The C programming language

The failded search for “foobar” will not be printed as an error or warning. It
should.

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