Merge pull request #1171 from dimagi/mc-reports

fix health facility selector
don't add facet_filters if filters is already empty
Merge pull request #1172 from dimagi/es-fix

don't add facet_filters if filters is already empty
don't try to divide by zero
Merge pull request #1173 from dimagi/wa-fix

don't try to divide by zero
sort users by username and add users even if they have no data