Radio Addons ad a "none" feature people don't want

[Valentina R]

This is part of core Product Addons plugin but one user already complained about it and I also don’t see any reason for having it. Can we remove the “none” option that is added to radio buttons by default if the field is NOT required.

Reported here.

Code that needs to be removed:

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[Željan Topić]

Removed with 4.17.2