CLC-4099 - Filters out nil or empty SIS Section IDs provided by Canvas::SectionsReport.
Merge pull request #2832 from redconfetti/QA-CLC-4099-incremental-refresh-bug-2

[QA] CLC-4099 - Fix bug with sections missing SIS Section ID in incremental refresh script
CLC-4099 - Updated Canvas::SiteMembershipsMaintainer to filter out invalid SIS Section IDs upon initialization. Added logger for invalid SIS Section IDs.
CLC-4099 - Remove log of non-matching SIS Section IDs
Merge pull request #2834 from redconfetti/QA-CLC-4099-incremental-refresh-bug-3

[QA] CLC-4099 - Updated Canvas::SiteMembershipsMaintainer to filter out invalid SIS Section IDs upon initialization