Subscription link issue when invited to a mailing list then unsubscribing

[raxelg]

If someone tries to resubscribe to a mailing list using the confirmation link after unsubscribing the following error pops up. The situation seems to be that it relies on the invited user being a pending member after being invited. However, if the user subscribed they are removed from the pending and are regularly subscribed. So, I suggest that if this situation arises to inform the user to subscribe to the mailing list (providing them the link to the mailing list) if the list is public. If the list private, tell them to contact the admins email for the mailing list (e.g. group_name+admins@murmur.csail.mit.edu) to ask to be invited again which we can provide.