Empty product list in waitinglist register form

[gilbertf]

Problem and impact

Having an event configured with an waiting list and fully booked will show the user the possibility to be added on the waitinglist (link to event/waitinglist?item=1". In case a product becomes available again, e.g. canceled orders or increased quota, but the user has not updated the page view he will open the waiting list page. Unfortunately the user will not be notified that a normal registration is again possible and will also not be able to complete the waiting list form as the required list field "Product" is empty.

Expected behaviour

I see these options:

1. Always allow the user to register to a activated waiting list, but I would assume this might create new issues and is not advisable
2. Show a message on the waitinglist view that registering to the waitinglist is not possible for the requested product/all products, but "normal" registration is available.
3. Directly redirect to the updated event view with "normal" registration option available again

I would assume Option 2 to be preferable as it will catch other potential waitinglist issues and does not allow for a ("invalid") form to be displayed that can not be completed.

Steps to reproduce

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Screenshots

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Link

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Browser (software, desktop or mobile?) and version

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Operating system, dependency versions

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Version

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[raphaelm]

I think option 3 with a message is best, we already have that if the form is submitted "too late"; we'd just need to add it to the form itself.