Remove margin on error-view when in an object list

Summary: I feel like this got derped by recent updates, who knows.

Test Plan:
Tested a failed Project search in Projects and in Dashboards. Spacing seems correct

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11755