Front page toggles between HTTP and HTTPS

If pages section at admin/build/securepages contains an empty line (what usually happens if someone hits ENTER after the last record) the front page toggles between HTTP and HTTPS each time you reload. The reason for this is that the empty line gets transformed into an empty or condition for the regular expression that matches urls and the empty or condition matches the front page.

I attached a simple patch that eliminates empty lines at the end of the list of pages when validating the admin form.