bug#9653: 24.0.50; `ucs-names' - Why all of the ("" . XXX) entries?

[Drew Adams]

> > Is (get-char-code-property c 'name) supposed to return ""
> > when the char has no name or is it supposed to return nil?
> > Either way is fine by me...
> 
> It returns "" in such a case in Emacs 24...
> ... the Unicode Name property, the default value is a null string.

I'm following your discussion about this, but I don't see how it relates much to
my question about `ucs-names'.

`ucs-names' can probably be used for more than just a COLLECTION arg for
completion.  But at least in that context I don't see how using nil in place of
"" would help at all (on the contrary, I would think).

The question I had was whether & why we want to keep these nameless entries in
`ucs-names'.  I have nothing against it really (I just filter them out), but I
wondered if they were intentional.  It sounds like the answer to that is yes,
but I wonder what the reason for keeping them is.  That's all.

Is the point in keeping these entries (regardless of whether we use "" or nil)
that we want an entry for each code point, even for the code points that do not
have names?  If so, then let's be explicit about that aim (e.g. add it to the
doc string or a comment).