R1:a439ea7190fb

Fix a bad parameter read in hovercard

Summary: I broke this at the last second in D17374. `getStrList()` doesn't read arrays. It probably should (more modern analogs do) but don't rock the boat in the leadup to the release cut.

Test Plan: Hovered over a thing, saw a hovercard and no `getStrList()` error in my logs.

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D17383