If the darcs add command is invoked without any arguments, it gives no feedback:

$ darcs add
$

In most cases the user probably intended "darcs add *" or a particular
file, which they forgot. Darcs should warn when no files are given.

Gwern says: Sounds good to me. darcs add --help does say 'Usage: darcs
add [OPTION]... <FILE or DIRECTORY> ...', which seems to me to say
that a file or directory is mandatory.

And in git:

$ git add
Nothing specified, nothing added.
Maybe you wanted to say 'git add .'?

The following patch updated the status of issue1423 to be resolved:

* Resolve issue1423: complain about empty add/remove. 
Ignore-this: 33f0cf72dc6d31e48d6fdda6b1f0883c