Form validation on /secr/sreq destroys be-there list

[rjsparks]

On a form validation error, the be-there list is set to range(n) where n was the number of Person objects in the field before the validation failed. The result is lists of be-there with names that look like, for instance:

>>> Person.objects.order_by('pk')[:3]
<QuerySet [<Person: (System)>, <Person: David Ely>, <Person: Vinton Cerf>]>

[rjsparks]

See also #3372

[rpcross]

Unable to reproduce this issue. Tried submitting new session request and editing existing session request using a bogus group name in a conflict field to cause a form validation error, do not see any issues with bethere names.

[rjsparks]

closing as OBE