The comment suggests that setting it to empty string was done on purpose, based on the
needs/evaluation of the developer, could be due to similar approach on other parts of the
acc module.
If you want to have it with null, you can make a pull request with this behaviour
controlled via a modparam, allowing the old approach as well as what you need. In this way
it is easier to accept it, knowing that people can choose based on what they need.
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