options.py: don't crash given semi-invalid optspecs.

options.py: don't crash given semi-invalid optspecs.

It's kind of weird to provide an argument without a description, but it's
not crash-worthy (especially when the crash was a totally unhelpful
exception stack trace).  While we're here, test for a couple of other ones
that didn't cause a crash, but we want to keep it that way.

And fix the copyright message; actually options.py started in 2010.

Signed-off-by: Avery Pennarun <apenwarr@gmail.com>