[ic] [interchange] Allow usernick to be NULL

[Josh Lavin]

Quoting Stefan Hornburg (Racke) (racke at linuxia.de):
> On 01/25/2017 11:06 PM, Josh Lavin wrote:
> > commit 997abee40cefd483caaa6805196657874572e5c7
> > Author: Josh Lavin <digory at cpan.org>
> > Date:   Wed Jan 25 14:04:53 2017 -0800
> > 
> >     Allow usernick to be NULL
> >     
> >     - will resolve issues with customer create from IC Admin
> >     - however, usernick will then be NULL
> >     - consider adding a usernick field to the customer creation form, or
> >       else use of UserDB fallback_login
> > 
> 
> Hello Josh,
> 
> wouldn't it better to use a default value of '' instead of allowing NULL?

No, because the field has a UNIQUE constraint.

-- 
Josh Lavin
End Point Corporation