R1:82c6f275bdce

Add links to empty result in Diffusion

Summary: I think that these are the only links that are useful - commit which
deleted the path and last version of the path.

Test Plan: Display deleted path, click on links.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D1536