Handle missing users when user mapping in Bitbucket Server importer
What does this MR do and why?
In some cases, the BBS API returns no user details. When user mapping was
enabled, we would previously try to create an Import::SourceUser with
a nil source_user_identifier
which led to an ActiveRecord::RecordInvalid error.
This change returns a nil user ID in this situation which is handled
by existing code in the same way as when user mapping is disabled.
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Edited by Luke Duncalfe