Colored nonograms with spaces inside solution

[serge-sb]

Nonogrid fails to solve a colored puzzle with an empty row or column within the puzzle. Single-colored (black) puzzles with such spaces are solved correctly. Nonogrid produces the following output:

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "Bad puzzle: simple propagation failed: UnsolvableLine"', src\main.rs:221:10
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Example tomls attached. tomls.zip