[Proceed up to creating a TOC even if some files were broken](https://github.com/amochin/robotframework-libtoc/commit/39ee3fbef53ea6cd0fde97a62cde71ae9417eccd)
[Print a summary of broken files in the end](https://github.com/amochin/robotframework-libtoc/commit/bb71ee43b65abab2e793e2cde0584253c4ecfed4)