Fusion: Workflow UI broken

[kaij]

Bug description

Opening Workflow UI on a project shows the following error message in the JS developer console. After this message, Workflow UI is broken / not usable.

{@context: "https://bluebrain.github.io/nexus/contexts/error.json", @type: "ValidationRejection", reason: "'[email protected]' did not match the expected label format '[a-zA-Z0-9_-]{1,64}'."}
@context: "https://bluebrain.github.io/nexus/contexts/error.json"
@type: "ValidationRejection"
reason: "'[email protected]' did not match the expected label format '[a-zA-Z0-9_-]{1,64}'."
...

This is possibly due to the format of the preferred_username field (e-mail address). Suggested fix: enhance allow any valid e-mail adresses in pattern check.