Fix null value in monorail payload

[mllemango]

WHY are these changes introduced?

TIL: false || nil returns nil

WHAT is this pull request doing?

Forcing the expression to return false instead of nil because monorail requests would fail silently due to a schema validation error where is_employee cannot be null

Update checklist

• I've added a CHANGELOG entry for this PR (if the change is public-facing)
• I've considered possible cross-platform impacts (Mac, Linux, Windows).
• I've left the version number as is (we'll handle incrmenting this when releasing).