Fix issues with '--all' argument

[Journeycorner]

This pull request fixes two issues I had with using the '--all' argument with list-units():

1. there was a deadlock, so the output would never arrive
2. the output for units in the state 'not_found' was messed up, because the unit name is then prefixed by '● '

[Journeycorner]

Fixed format.

[gwbres]

sorry apparently some stringent "clippy" rules are applied by CI/CD and by defaults.
it probably got added at some point in this project but I did not notice.

FYI, if you're not familiar with it already, you can apply clippy at compilation and have it "fix" the code right away. For that, you can take a look at the clippy.sh script in my https://github.com/georust/rinex/tools repo

[Journeycorner]

sorry apparently some stringent "clippy" rules are applied by CI/CD and by defaults. it probably got added at some point in this project but I did not notice.

FYI, if you're not familiar with it already, you can apply clippy at compilation and have it "fix" the code right away. For that, you can take a look at the clippy.sh script in my https://github.com/georust/rinex/tools repo

Sounds reasonable. I applied the fix and force pushed.

[gwbres]

heading to bed, will fix that tomorrow morning

[Journeycorner]

@gwbres my last commit should fix the clippy issue. Let me know if I can help.

Btw.: Your create was very useful to me for writing a GUI for systemd: https://github.com/Journeycorner/systemd-gtk. Thanks a lot! It currently uses the patched version of systemctl under the hood.