message: [scmd] Ignore empty string in console arguments.
diff: @@ -296,7 +296,12 @@ where
  let readline = rl.readline(prompt.as_str());
  match readline {
  Ok(line) => {
  - let params: Vec<&str> = line.trim().split(' ').map(str::trim).collect();
  + let params: Vec<&str> = line
  + .trim()
  + .split(' ')
  + .map(str::trim)
  + .filter(|s| !s.is_empty())
  + .collect();
  let cmd_name = params[0];
  match cmd_name {
  "quit" | "exit" | "q!" => {
  