Fix linebreaking for lines without text runs #839

Job	Run time
cargo clippy (android) (armv7-linux-androideabi)	54s
cargo check (msrv) (windows-latest)	56s
cargo clippy (android) (aarch64-linux-android)	1m 32s
cargo clippy (windows-latest)	1m 48s
cargo check (msrv) (macos-latest)	35s
cargo check (msrv) (android) (armv7-linux-androideabi)	27s
cargo clippy (android) (x86_64-linux-android)	1m 44s
cargo clippy (macos-latest)	55s
cargo check (msrv) (ubuntu-latest)	23s
cargo check (msrv) (android) (aarch64-linux-android)	40s
cargo clippy (ubuntu-latest)	1m 2s
cargo check (msrv) (android) (x86_64-linux-android)	39s
cargo doc (windows-latest)	1m 3s
formatting	14s
cargo doc (macos-latest)	26s
cargo test (windows-latest)	2m 18s
cargo doc (ubuntu-latest)	23s
typos	4s
cargo test (macos-latest)	30s
cargo test (ubuntu-latest)	28s
	17m 1s

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