Print "Cleaned nothing" instead of "Cleaned 0.00 B"

[Expurple]

Implement #93. I liked "Cleaned nothing from" variant and chose that.

Example output from that issue now looks like this:

[INFO] Cleaned nothing from "/home/marcospb19/cargo-sweep/target"
[INFO] Cleaned nothing from "/home/marcospb19/code/rust/target"
[INFO] Cleaned nothing from "/home/marcospb19/ds/client/target"
[INFO] Cleaned nothing from "/home/marcospb19/ds/file-backed-queue/target"
[INFO] Cleaned nothing from "/home/marcospb19/ds/gui/target"
[INFO] Cleaned nothing from "/home/marcospb19/ds/proto/target"
[INFO] Cleaned nothing from "/home/marcospb19/ds/recording-datatypes/target"
[INFO] Cleaned nothing from "/home/marcospb19/ds/scoring/target"
[INFO] Cleaned nothing from "/home/marcospb19/ds/server/target"
[INFO] Cleaned nothing from "/home/marcospb19/ds/server-store/target"
[INFO] Cleaned nothing from "/home/marcospb19/languages/cacau/target"
[INFO] Cleaned 70.13 KiB from "/home/marcospb19/languages/cocoa/target"
[INFO] Cleaned nothing from "/home/marcospb19/languages/dada/target"
[INFO] Cleaned nothing from "/home/marcospb19/languages/lalrpop/target"
[INFO] Cleaned nothing from "/home/marcospb19/languages/lox/target"
[INFO] Cleaned nothing from "/home/marcospb19/languages/rustfmt/target"
[INFO] Cleaned nothing from "/home/marcospb19/languages/sushi/target"
[INFO] Cleaned nothing from "/home/marcospb19/ouch/target"
[INFO] Cleaned nothing from "/home/marcospb19/ouch/target/package/ouch-0.4.0/target"
[INFO] Cleaned nothing from "/home/marcospb19/rust-skeleton-hexagonal/target"
[INFO] Cleaned 23.63 KiB from "/home/marcospb19/stuff/dotao/target"
[INFO] Cleaned 23.88 KiB from "/home/marcospb19/stuff/fs-tree/target"
[INFO] Cleaned 6.48 GiB from "/home/marcospb19/stuff/keyrocky/target"
[INFO] Cleaned nothing from "/home/marcospb19/stuff/reflect/target"
[INFO] Cleaned 3.04 KiB from "/home/marcospb19/stuff/wsid/target"

I think, it's pretty nice. Uniform and easy to skim at the same time.

[marcospb19]

Thank you!!