Nigel Cunningham authored Aug 06, 2014 and Robert Lyon committed Feb 09, 2015

Avoid the query for an existing artefact record when we know it doesn't
exist (because we're being called from create_user). This shaves
approximately 40% off the time for creating a user.

Change-Id: I81697dfd0916e4a2933dfe5d1389bdc649e6e856
Signed-off-by: Nigel Cunningham <nigelc@catalyst-au.net>