Catch exceptions in didRunLinters()
Catch exceptions in didRunLinters()

Test Plan: Threw in `didRunLinters()` of one linter, still saw the result of other linters and "Some linters failed" at the end.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5124

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