Conpherence - fix a few bugs

Summary: Fixes T3280 - when a pontificate brought back multiple transactions, we were rendering a comma. Yay hsprintf. Also fixes the noconpherences view, which broke at some point recently.

Test Plan: sent comment, then replied from different browser. when both comments loaded noted no comma. loaded a conpherence view with no conpherences and verified it looked good.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin, chad

Maniphest Tasks: T3280

Differential Revision: https://secure.phabricator.com/D6079