don't require an item selected for SELECT size>1 non-multiple

This had been discussed a bit a few years ago. At the time, the html4 spec's
idea was that you probably should require one but that implementations varied
on the details.

These days, firefox doesn't, and html5 mostly tells you not to (and is clear
that you can deselect the only selected one). (The world's biggest document,
practically a browser written in english at the instruction level, and it
still has many cases that aren't considered and spelled out carefully at this
point.)

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