message: Handle pool open error
diff: @@ -86,6 +86,7 @@ pub mod connect_command {
  set_connected_pool(ctx, Some((handle, name.to_owned())));
  Ok(println_succ!("Pool \"{}\" has been connected", name))
  }
  + Err(ErrorCode::PoolLedgerTerminated) => Err(println_err!("Pool \"{}\" does not exist.", name)),
  Err(err) => Err(println_err!("Indy SDK error occurred {:?}", err)),
  }
  });
  @@ -198,9 +199,9 @@ pub mod delete_command {
  trace!(r#"Pool::delete return: {:?}"#, res);
  let res = match res {
  - Ok(()) => Ok(println_succ!("Pool \"{}\" has been deleted", name)),
  + Ok(()) => Ok(println_succ!("Pool \"{}\" has been deleted.", name)),
  Err(ErrorCode::CommonInvalidState) => Err(println_err!("Connected pool cannot be deleted. Please disconnect first.")),
  - Err(ErrorCode::CommonIOError) => Err(println_err!("Pool \"{}\" not found or unavailable", name)),
  + Err(ErrorCode::CommonIOError) => Err(println_err!("Pool \"{}\" does not exist.", name)),
  Err(err) => Err(println_err!("Indy SDK error occurred {:?}", err)),
  };
  