Add required needMembers/needWatchers calls to Project Profile/Subprojects tabs

Summary:
Fixes T12710. See that task for discussion. This is pretty ugly/redundant but not broken.

(Feel free to reject this and pursue something else.)

Test Plan:
  - For a project with active subprojects/milestones, viewed the project profile and subprojects tabs.
  - After patch: they're ugly, but no longer fatal.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12710

Differential Revision: https://secure.phabricator.com/D17882

src/applications/project/controller/PhabricatorProjectSubprojectsController.php

@@ -31,6 +31,8 @@ final class PhabricatorProjectSubprojectsController
         ->setViewer($viewer)
         ->withParentProjectPHIDs(array($project->getPHID()))
         ->needImages(true)
+        ->needMembers(true)
+        ->needWatchers(true)
         ->withIsMilestone(false)
         ->execute();
     } else {
@@ -42,6 +44,8 @@ final class PhabricatorProjectSubprojectsController
         ->setViewer($viewer)
         ->withParentProjectPHIDs(array($project->getPHID()))
         ->needImages(true)
+        ->needMembers(true)
+        ->needWatchers(true)
         ->withIsMilestone(true)
         ->setOrderVector(array('milestoneNumber', 'id'))
         ->execute();