Matches https://github.com/ilyagr/pijul-clone as of now, might become out of sync

Return a clean error instead of a panic when the channel for a commit is not found in `pijul git`

Created by  pmeunier  on February 26, 2021
NHO3QO3WZTJBRPGIQVLNPHUYAB6YMTDOPHNGGTYVPSTP47TBQJ2AC
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