`missingPIIMessage()` returns message at registration count level but results are printed at state level

[lawalter]

For example, error message in console reads:

Error: 2 registrations are missing critical combinations of PII (making up >10% of a file and/or >100 records).

Whereas results print a 2-row data frame, with 1 row per state, indicating a total of 420 affected registrations. Either use sum(n) in the error message (e.g., Error: 420 registrations are missing...) or report number of states returned in the results (e.g., Error: 2 states are missing...).