message: feat: allow use of empty 'alias' (print if exists)
diff: @@ -75,7 +75,11 @@ pub fn builtin_alias(args: &[types::Str], shell: &mut Shell<'_>) -> Status {
  }
  Binding::ListEntries => print_list(shell.variables()),
  Binding::KeyOnly(key) => {
  - return Status::error(format!("ion: please provide value for alias '{}'", key));
  + if let Some(alias) = shell.variables().get(&key) {
  + println!("alias {}='{}'", key, alias);
  + } else {
  + return Status::error(format!("ion: alias '{}' not found", key));
  + }
  }
  }
  Status::SUCCESS
  