R1:354858e43406

Disambiguate isEmpty()

Summary:
Fixes T10250.

Rename the one I added to `hasAnyProperties()` for clarity.

Test Plan:
- Viewed a project profile with content.
- Viewed a project profile with no properties.
- Viewed a workboard with tasks that had a mixture of additional projects and no additional projects.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10250

Differential Revision: https://secure.phabricator.com/D15151