R1:9e3f3e692d7f

Use didRejectResult() when querying workboard columns

Summary: Fixes T9250. Ref T4345.

Test Plan:
Faked a policy error:

{F748975}

Reviewers: joshuaspence, chad

Reviewed By: chad

Maniphest Tasks: T4345, T9250

Differential Revision: https://secure.phabricator.com/D13981