Don't encode empty strokes #1927

Job	Run time
cargo check (aarch64-android)	19s
cargo check (msrv) (wasm32)	41s
cargo clippy (windows-latest)	2m 13s
cargo clippy (macos-latest)	1m 21s
cargo check (msrv) (windows-latest)	1m 44s
cargo clippy (wasm32)	1m 22s
cargo clippy (ubuntu-latest)	1m 26s
cargo doc	1m 43s
cargo check (msrv) (macos-latest)	38s
cargo check (msrv) (ubuntu-latest)	43s
formatting	33s
cargo test (wasm32)	30s
Prime LFS Cache	9s
typos	5s
cargo test (windows-latest)	1m 58s
cargo test (macos-latest)	1m 27s
cargo test (ubuntu-latest)	3m 33s
	20m 25s

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