Based on discussion #315 from the Pijul repository, this patch adds some basic output for commands where no information was being surfaced to the user.
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for p in txn.iter_working_copy() {
let p = p?.1;
writeln!(stdout, "{}", p)?;
if txn_iter.peek().is_none() {
eprintln!("No tracked files");
} else {
for p in txn_iter {
let p = p?.1;
writeln!(stdout, "{}", p)?;
}