[Plugin: Advanced Custom Fields – Taxonomy Field add-on] Allow null does not have a value, is not it

Hi,thanks for this plugin. It’s very usefull!

But i wondering….

[Case]
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Field Type : Taxonomy
Imput Method : Select
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‘Allow null’ does not have a value, is not it?

http://wordpress.org/extend/plugins/advanced-custom-fields-taxonomy-field-add-on/