An attempt to clear a icon fails to clear the icon

[John Pugh]

When submitting an application, I added a 32px icon inadvertently. When attempting to remove the 32px icon, I check the clear box and submit the changes. The icon remains.

Expected behavior: Check the "clear" checkbox, save, icon is removed.

[Anthony Lenton (elachuni)]

Attempting to remove via the admin also fails, with the following traceback in an oops:

Traceback:
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/core/handlers/base.py" in get_response
  111. response = callback(request, *callback_args, **callback_kwargs)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/contrib/admin/options.py" in wrapper
  307. return self.admin_site.admin_view(view)(*args, **kwargs)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/utils/decorators.py" in _wrapped_view
  93. response = view_func(request, *args, **kwargs)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/views/decorators/cache.py" in _wrapped_view_func
  79. response = view_func(request, *args, **kwargs)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/contrib/admin/sites.py" in inner
  197. return view(request, *args, **kwargs)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/utils/decorators.py" in _wrapper
  28. return bound_func(*args, **kwargs)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/utils/decorators.py" in _wrapped_view
  93. response = view_func(request, *args, **kwargs)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/utils/decorators.py" in bound_func
  24. return func(self, *args2, **kwargs2)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/db/transaction.py" in inner
  217. res = func(*args, **kwargs)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/contrib/admin/options.py" in change_view
  962. if form.is_valid():
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/forms/forms.py" in is_valid
  121. return self.is_bound and not bool(self.errors)
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/forms/forms.py" in _get_errors
  112. self.full_clean()
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/forms/forms.py" in full_clean
  267. self._clean_fields()
File "/srv/sc.ubuntu.com/production/software-center-agent/sourcecode/django/django/forms/forms.py" in _clean_fields
  287. value = getattr(self, 'clean_%s' % name)()
File "/srv/sc.ubuntu.com/production/software-center-agent/src/softwarecenteragent/forms.py" in clean_icon_32
  101. return self._clean_icon(32)
File "/srv/sc.ubuntu.com/production/software-center-agent/src/softwarecenteragent/forms.py" in _clean_icon
  70. if data.name.endswith('.svg'):

Exception Type: AttributeError at /admin/softwarecenteragent/application/320/
Exception Value: 'bool' object has no attribute 'name'