The FAS shows me a python error when I query for an e-mail address that does not belong to any user, at least this is what I assume. This is really annoying, since a lot of Review Requests that should, do not block FE-NEEDSPONSOR and when I query the e-mail address from the reporter I never know whether FAS has a problem or whether the user is unknown.
This is a known issue :( We have basically put all current account system changes on hold unless they are urgent/security related in favor of spending that time on FAS2 which is actually nearing completion (and a complete rewrite). If you're interested and want to help test, the most recent version is:
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