[Done v1.5] Telephone number len = 0, ok for customer registration, not for admin

[stevenheintz]

Have been kicking the tires on 1.5.0BETA

Noticed that we can set the telephone number min length to zero, and this makes the field not required for customer registration

However when viewing the record in the admin app, anytime you hit update, an error comes up:

* The 'Telephone Number' entry must have at least 0 characters.

you can't proceed unless you put something (junk) in the telephone number field