Update models.py

[gabn88]

Fix migration 0004

[dokterbob]

Thanks! Are you absolutely sure this patch does not affect the functionality?

[gabn88]

I’m positive. Only place get_default* is used is in the admin form for importing addresses, and that form is still working.

[dokterbob]

You double checked that the default is properly set? :)

[gabn88]

The first newsletter was selected for me, so either it works fine or Django auto selects the first one (which equals the default), so should be good to go :)