form validation for empty checkboxes that are not required (and they are the only fields present)

I have some modelforms within a <form>. Each form has one
checkboxselectmultiple that is not required. If I post nothing (all
checkboxes are empty) then all of the forms are invalid. If I post
anything then all of the forms are valid. This anything could be that
one of the forms has a box checked, or that I add <input type='hidden'
name='omg' value='wtf'> to the form.

This constitutes a bug? Is there already an issue? Is there
something standard I can do to make it work without the hidden field
or is the hidden field a good way to go?

POSTing with no data:

Th[4320923648] 2010-09-27 12:13:48,689 cms.views [DEBUG ] POSTing to
edit_assets with <QueryDict: {}>
Th[4320923648] 2010-09-27 12:13:48,695 cms.forms [DEBUG ] the
formset data is <QueryDict: {}>
Th[4320923648] 2010-09-27 12:13:48,695 cms.forms [DEBUG ] forms are:
[<cms.forms.AssetLanguageForm object at 0x10341ad90>,
<cms.forms.AssetLanguageForm object at 0x10341aed0>]
Th[4320923648] 2010-09-27 12:13:48,695 cms.forms [DEBUG ] asset
metadata formset validation: [False, False] (.is_valid() on the
forms)
Th[4320923648] 2010-09-27 12:13:48,695 cms.forms [DEBUG ] errors?
[{}, {}]
[27/Sep/2010 12:13:48] "POST /portal/edit-assets/?collection=foobar
HTTP/1.1" 200 2434

if anything is in the POST, the forms are valid.

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