you can do the same thing with $iif so instead of having that elseif just do

alias ChanInfo {
  echo -ta ----------
  echo -ta Channel Info for $iif(!$1,$chan,$1) at $asctime(hh:nn:ss tt) on $network $+ / $+ $server
  echo -ta Current Modes: $chan($iif(!$1,$chan,$1)).mode - Current  Topic: $chan($iif(!$1,$chan,$1)).topic
  echo -ta Total Users: $nick($iif(!$1,$chan,$1),0) - (&) Admins: $nick($iif(!$1,$chan,$1),0,a,ohvr) - (@) Ops: $nick($iif(!$1,$chan,$1),0,o) - (%) HalfOps: $nick($iif(!$1,$chan,$1),0,h) - (+) Voices: $nick($iif(!$1,$chan,$1),0,v) - Regulars: $nick($iif(!$1,$chan,$1),0,r)
  echo -tsa ----------
}