Reviewers block always visible on editorial masthead even when no reviewers exist

[NateWr]

Describe the bug
On the new Editorial Masthead page in the main branch (3.5 pre-release), the "Peer Reviewers" heading and description is shown, even if no reviewers exist.

To Reproduce
Steps to reproduce the behavior:

1. Load a test instance using the appropriate dataset for main
2. Go to the Editorial Masthead page on the reader-facing frontend.
3. See error

What application are you using?
main branch (3.5 pre-release)

[NateWr]

This happened because a LazyCollection is passed to the template, which always returns true in a if (!empty($reviewers)).

PR:
#10717

Tests:
pkp/ojs#4559

[bozana]

Thanks a lot @NateWr! Merged...