Handle non free extension with regcode

[jesusbv]

Description

When registering a PAYG system with a registration code for an add-on product, if the product needs to be activated via SCC, do not raise the exception unless there is not token for the activation

• Related Issue / Ticket / Trello card:

How to test

Register a system with the LTSS regcode (new LTSS code on the client), this exception should not raise

Change Type

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• [X] Bug Fix (a non-breaking change which fixes an issue)
• [ ] New Feature (a non-breaking change which adds new functionality)
• [ ] Documentation Update (a change which only updates documentation)

Checklist

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• [X] I have reviewed my own code and believe that it's ready for an external review.
• [X] I have provided comments for any hard-to-understand code.
• [ ] I have documented the MANUAL.md file with any changes to the user experience.
• [ ] If my changes are non-trivial, I have added a changelog entry to notify users at package/obs/rmt-server.changes.

Review

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