R1:710fc0ce7ff9

Don't render anything on project homepages if there are no properties at all

Summary: Ref T10054.

Test Plan:
{F1068420}

Also looked at a project which did have stuff to make sure the stuff still worked.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10054

Differential Revision: https://secure.phabricator.com/D15102