empty? returns list of bools instead of a single bool

[rgwood]

Describe the bug

I think I've found a regression in the empty? command; if you pipe it a list, it outputs a new list instead of a scalar value.

How to reproduce

Run [red green blue] | empty?, note that it returns a list of booleans.

Expected behavior

I expected empty? to return a single boolean indicating whether the list it was given is empty.

Screenshots

Configuration

key	value
version	0.59.1
branch	main
short_commit	97b3e4a
commit_hash	97b3e4a
commit_date	2022-03-03 19:05:55 +00:00
build_os	windows-x86_64
rust_version	rustc 1.59.0 (9d1b2106e 2022-02-23)
rust_channel	stable-x86_64-pc-windows-msvc
cargo_version	cargo 1.59.0 (49d8809dc 2022-02-10)
pkg_version	0.59.1
build_time	2022-03-03 12:09:15 -08:00
build_rust_channel	debug
features	dataframe, default, trash, which, zip
installed_plugins

Additional context

There is an example for empty? in the docs which is how I first noticed this. https://www.nushell.sh/book/working_with_lists.html

[hustcer]

Relevant issue: #3903