Ensure undefined values don't break alphabetizing
Ensure undefined values don't break alphabetizing

fixes 11250

Change-Id: I82e9c17b61391e45f8e42b64c01cb614cb06fe14
Reviewed-on: https://gerrit.instructure.com/14384
Reviewed-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>
Reviewed-by: Cameron Matheson <1d572acbfa68c7c6e541c7b840d6b622e5c0dc91@instructure.com>
Tested-by: Bryan Madsen <0a3ba1af216659500dd8f41e29f3979f42452870@instructure.com>

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