add missing fixture to MembersHelperTest Test fails randomly. <pre> 1) Error: MembersHelperTest#test_render_principals_for_new_members: ActiveRecord::RecordInvalid: Validation failed: trackers is invalid, trackers is invalid, trackers is invalid test/object_helpers.rb:38:in `generate!' test/unit/helpers/members_helper_test.rb:29:in `test_render_principals_for_new_members' </pre> It can be reproduced on clean database and following change. <pre> - fixtures :projects, :users, :members, :member_roles + fixtures :projects, :users, :members, :member_roles, + :trackers </pre> git-svn-id: http://svn.redmine.org/redmine/trunk@13749 e93f8b46-1217-0410-a6f0-8f06a7374b81