Update and report status even after empty command

Update and report status even after empty command

When getcommand() reads an empty string, it prints another prompt and
reads another line, without running status().  That's bad:

* nat_timeused is not updated.  Affects the player's prompt, deities'
  nat selector timeused, and commands edit, players, xdump nat.

* Mortal player isn't logged off for game hours, game down, and time
  limit.

* Notifications are delayed: going broke, becoming solvent, new
  telegrams (toggle inform off only), new announcements, capital lost.

Fix by removing the loop.  Callers handle empty input just fine since
4.2.2.

Side effect: empty commands are now recorded in player_commands[].
That's okay.