HH Membership End Dates needs to consider no HH

[greenstork]

Right now, the HH Membership End Date field is a cross-object formula to the related HH. If there is no related HH though, it should just inherit the Membership End Date from the contact.

[groundwired]

Should make this fix to every cross-object formula on contact that looks to household - if there is no HH, it should fall back to the contact's own value (to support better reporting).

[mscholtz]

This was fixed, right?