Fallback user should have the option "Unassigned"

Description

You can select the option "None" in the fallback user field. Choosing this value is the same as choosing nothing/leaving it blank. 

Also, it should be possible to select a fallback user "unassigned", so that if no matches are found for users, the field would be set to "unassigned".

Environment

None

Assignee

Unassigned

Reporter

Sync User [K15t]

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UI Concept

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Priority

Major