Specify a null behavior for the callsign sort column.
Fixes paging on the Diffusion Repository List.
PhabricatorRepositoryQuery needs to specify a behavior for null on the OderableColumns definition for the callsign column.
- On an instance with more than 100 repositories
- some of which are missing a callsign
- Attempt to sort by callsign.
- See the sorted results
- Exception: "Column "0" has null value, but does not specify a null behavior."
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Differential Revision: https://secure.phabricator.com/D18773