evaluate booked participant list before adding #1608
Merged
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Description
This PR fixes an error where clicking the Book all button will add all signed up participants to the booked participant list, without checking if they are already in it, making the list contain duplicates.
Screenshots
[Add screenshots here]
Changes
[Add a list of features added/changed, bugs fixed etc]
Notes to reviewer
My first ever pr in Zetkin. And type script too! yay
Related issues
Resolves #1591