Run dataset process requires a useless refresh

Refs https://redmine.teklia.com/issues/6469

STR from @yschneider :

• Create a dataset process
• Add a dataset from the corpus you started the process
• Configure workers
• Add any worker
• Try to launch, spoiler: you can't (button stays disabled)
• After a F5, it suddenly becomes OK

It probably lacks a reference towards datasets (and their sets) in a store ?