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Correct rendering of workboard column move stories when a single transaction…

Description

Correct rendering of workboard column move stories when a single transaction performs moves on multiple boards

Summary:
See https://discourse.phabricator-community.org/t/unhandled-exception-rendering-maniphest-task/3234.

If a single transaction performs column moves on multiple different boards (which is permitted in the API), the rendering logic currently fails. Make it render properly.

Test Plan:

Screen Shot 2019-11-08 at 4.53.06 PM.png (50×894 px, 14 KB)

Differential Revision: https://secure.phabricator.com/D20901