Consent count report should not count missing constents as consents with unknown date

[olle]

Consent count report should not count missing constents as consents with unknown date. The "Unknown date" column in the first table in the consent count report should only include items coupled to an actual consent form. However, the second table should still include a column with missing consents, but the table title should be clarified to read "# Consent forms of different types for cases and blood samples with unknown consent date, as well as items with missing consent".