course purchase PR broke default store license purchase

[williamstein]

@haraldschilly 's PR #8437 surprisingly broke default license purchase in the store thus -- when you click "Add to cart" it fails:

I cannot reproduce this in my dev environment, where there's no error.

it's definitely javascript in the frontend, since it happens with network disabled.

Reading the code suggested one thing that might fix it:

c7f7d31

but that change did NOT fix it.

[williamstein]

This is a blocker, since it could easily get released again by accident. The plan, I guess:

• Either it gets fixed in the next week,
• Revert all he commits from the PR
• Rewrite the code to not use forms (the PR comment says "The main problems I faced in this PR is how URL vs. form values are handled.").

[williamstein]

It turns out 81486b6 did in fact fix this problem, and also improves the code a little...

[haraldschilly]

Thank you! I had no time to look into this. I'll check the fix of yours.