nmap yiw mapping when <2 characters

Hi -

I'm trying to get a mapping to work irrespective of the number of
characters in the document. The following is a simplified example
which does the rather strange task of copying the current word, then
pasting it and appending a question mark:

:nmap <buffer> <F3> yiw pa?<Esc>

Note this is only for demo purposes, in my application I pass the
yanked text to a function that does something useful. The above map
works, *but* never does anything when the buffer is completely empty
or only has one character in it.

For example, if I press F3 on an empty buffer, I'd expect the buffer
to have a question-mark added. If I press F3 on a buffer containing
only "g", I'd expect to end up with "gg?". But in both cases, nothing
happens.

Yet if I press F3 on a buffer containing "ug" I get "ugug?" as
expected.

Is there some alternative I can use, so that I can act on a string
even if it has zero or one characters?

Thanks
Dan
(vim 7.3 on ubuntu 11.10)

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