When migrating from Trac the rake task selects users inconsistently because it only grabs users who have created a ticket, wiki page or attachment. This means some users are migrated with user name and email address and others are not. The script should use the contents of the session_attribute table like:

INSERT INTO "session_attribute" VALUES('blah',1,'name','Blah Blah');
INSERT INTO "session_attribute" VALUES('blah',1,'email','Blah@Blah');

This could be done either as a supplemental query in the find_or_create_user class or a separate migration task.