fix: Check if user exists when editing account
We should check if a user (target) exists before validating permissions, otherwise things crash when a TU is trying to edit an account that does not exist.
Fixes: aurweb-errors#529
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We should check if a user (target) exists before validating permissions, otherwise things crash when a TU is trying to edit an account that does not exist.
Fixes: aurweb-errors#529