===Acceptance criteria===
**Acceptance Criteria:**
* Given that an organizer opens Special:InvitationList (with no list ID),
** Then they should be redirected to Special:MyInvitationLists
* Given that an organizer opens Special:InvitationList/X, where X is a list ID that does not exist,
** Then they should see the following error:
*** This invitation list does not exist. [[Special:MyInvitationLists | View your invitation lists ]].
* Given that an organizer opens Special:InvitationList/X, where X is a list ID that is invalid,
** Then they should see the following error:
*** Provide an invitation list ID with only numbers. [[Special:MyInvitationLists | View your invitation lists ]].
* Given that an organizer opens Special:InvitationList/X, where X is a list ID that was not created by the current user,
** Then they should see the following error:
*** You don't have permission to view this invitation list because you didn't create it. [[Special:MyInvitationLists | View your invitation lists ]].