Wiped ErrorView from PhrictionDeleteController

Summary: Exactly what it says on the tin

Test Plan: deleted an document in all kinds of fashions. No fatalities, no exceptions, all dialogs appeared fine.

Reviewers: epriestley, chad, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2686

Differential Revision: https://secure.phabricator.com/D5331