Filter out schools without active students on districtwide page (eg, PIC) #2246
Who is this PR for?
What problem does this PR fix?
Certain school codes that serve only administrative purposes can appear on the districtwide admin page, but they have no students when folks click in.
What does this PR do?
Removes those schools.
Which features or pages does this PR touch?
Does this PR use tests to help verify we can deploy these changes quickly and confidently?