adding check for number of populations a measure has to search for rationale. some measures have a nil sub_id so that needed to be accounted for
adding check for number of populations a measure has to search for rationale. some measures have a nil sub_id so that needed to be accounted for

PheMA/health-data-standards,projectcypress/health-data-standards,projectcypress/health-data-standards,Xodarap/health-data-standards,okeefm/health-data-standards,PheMA/health-data-standards,thecristen/health-data-standards,Xodarap/health-data-standards,thecristen/health-data-standards,okeefm/health-data-standards