As a mismatch provider I want to be able to report missing data in order to improve the completeness of Wikidata.
We currently don't allow reporting of mismatches where the value on Wikidata is empty. We should. We assume this means we will accept empty Wikidata values in the upload CSV. This also means we will not get a statement guid in the upload for the non-existent statement. We will likely have to adapt the upload CSV format to require the Item ID as well to be bale to tell which Item the missing statement belongs to.
[ ] mismatches with empty Wikidata values and empty empty statement guid are accepted from the upload CSV
[ ] mismatches with empty Wikidata values shown in the Mismatch Finder website as "none" for the Wikidata value
[ ] the upload CSV should now accept an Item ID for all mismatches
[ ] documentation for mismatch providers is updated