unhandled promise rejection when trying to set a wrong parameter in project setting

[ntraut]

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Current behaviour

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When we try to set a wrong parameter in a project setting page like for example a collaborator which is not registered and then we click on save project, an unhandled promise rejection happens server side and client side we have no feedback, neither in the console nor in the page.

Expected behaviour

a message should appear in the place of "succesfully saved" and no unhandled promise rejection should happen

Version information (for bug reports)

current version