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Don't depend on "XMLWriter" to load the lint renderer class tree

Authored by epriestley on Thu, Feb 13, 9:36 PM.

Description

Don't depend on "XMLWriter" to load the lint renderer class tree

Summary: Fixes T13489. See that task for discussion.

Test Plan: Ran arc lint and arc lint --output xml. Faked a missing extension, ran arc lint (no problems) and arc lint --output xml (sensible error message).

Maniphest Tasks: T13489

Differential Revision: https://secure.phabricator.com/D20989