message: [scmd] fix empty table print panic.
diff: @@ -73,6 +73,9 @@ pub fn fmt_table(value: Value) -> Result<()> {
  Value::Array(values) => values,
  value => vec![value],
  };
  + if values.is_empty() {
  + return Ok(());
  + }
  let first = &values[0];
  let first_value = serde_json::to_value(first)?;
  if first_value.is_null() {
  