Fix /autoaway command logic

Two issues were fixed in the parser logic:
* A call to cons_bad_cmd_usage() was placed at the end of the "time"
  parser section that blocked reachability to both "message" and
  "check" parser sections. This caused "/autoaway message ..." and
  "/autoaway check ..." to always fail with "Invalid usage". This
  issue was introduced in commit 3c1e4ba.
* "/autoaway message xa" with no message argument returns message
  set to (null). This should be fixed the same way as
  "/autoaway message away" was fixed in commit 3c1e4ba.

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