Opening participations dialog in coursebook still does additionial GraphQL queries

assigned to @ZugBahnHof

added part::frontend source::customer::kath type::bug labels

created branch 334-opening-participations-dialog-in-coursebook-still-does-additionial-graphql-queries to address this issue

mentioned in merge request !439 (merged)

closed with commit a1aedec2

mentioned in commit a1aedec2