Miscellaneous documents fixes

Ghost User
2018-03-20T12:55:59+01:00

Closes #612 Fixes the following: 1. The migrations now hopefully work 2. It's now possible to set `members_only` on minutes 3. It's now possible to make a `GeneralMeeting` without any documents.

Closes #612 (closed)

Fixes the following:

1. The migrations now hopefully work

2. It's now possible to set members_only on minutes

3. It's now possible to make a GeneralMeeting without any documents.