certificate-whitelist-mode: Triple-fix previous-history-urls-suggestion-filter.
certificate-whitelist-mode: Triple-fix previous-history-urls-suggestion-filter.

previous-history-urls-suggestion-filter used to error for 3 reasons:

- Empty URL.
- Empty history.
- History URLs are now quri:uri, not strings.

jmercouris/NeXT,jmercouris/NeXT