Collective.eeafaceted.batchactions

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- Nothing changed yet.

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- Overrided `Form.__call__` to not render if request reponse status
is 204 (No content) as it is already the case when response status is 302 or
the portal message is not displayed after faceted refresh because
it was already displayed on the closing form.
[gbastien]
- Added Attributes in modified call to specify which attribute has been modified.
[cadam, sgeulette]
- Corrected typo
[sgeulette]

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- Check again `self.do_apply` in `BaseBatchActionForm.handleApply` to avoid
nasty behaviors.
[gbastien]

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- Overrided `ContactBaseBatchActionForm.available` method to handle anonymous
search correctly.
[sgeulette]

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- Import `safe_encode` from `imio.pyutils` instead `imio.helpers`.
[gbastien]
- Check `available` in `update` instead in `handleApply` so form is not
displayed at all if user have not access.
[gbastien]

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- In `BaseARUOBatchActionForm._apply`, return the elements that were actually
updated so it may be used when overriding the base view.
[gbastien]
- Avoided exception when a field value is None and we want to get a list or set
[sgeulette]