[dev] Signup.php - avoid some errors

[John Morrissey]

On Fri, Dec 26, 2003 at 12:56:43PM +0100, steve wrote:
> in lib/signup.php, if some fields are missing, we setup a default value

I committed the 'required' part (thanks!), but it doesn't make much sense to
me to have a field with no label.

john
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