Enterprises have an `address_id` which must point to a valid
`Spree::Address`. As Rubocop suggested, I restricted the deletion of
addresses when they are still associated to an enterprise.
Without declaring `dependent: :restrict`, trying to delete the address
would raise `ActiveRecord::InvalidForeignKey`. Now it is more specific
and raises `ActiveRecord::DeleteRestrictionError`.
I didn't find code rescuing the InvalidForeignKey when deleting addresses. I
actually think that we never delete addresses. So this change should not
have any impact on the execution.
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