Only shift positional parameters if there are any

bash 5.0 now enables its 'shift_verbose' option in POSIX mode by
default, printing an error message if there's not enough positional
arguments for the `shift` builtin.

We rely on the previous (silent) behaviour in two places. For main
command parsing, introduce an explicit check before invoking `shift` to
make sure it is only called if there are enough positional arguments.

The call to `shift` in the list() method is actually superfluous, as no
more than one positional argument is ever referenced; we drop it fully
there.

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