The NFL was a joke Sunday, at a time when nothing about the coronavirus warrants laughter. In Baltimore, the Ravens reported a positive test for the eighth straight day, further jeopardizing a twice-delayed game against the undefeated Pittsburgh Steelers. In the Bay Area, the San Francisco 49ers were rendered temporarily homeless, if they want to keep playing football, because of local restrictions. And in Denver, the Broncos played — or something like that — without a true quarterback.