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

Improve error handling for nonexistent channels

Created by  ammkrn  on June 1, 2021
GFED4ORASDTMUQUCOXXZMOXSR6JJGCP3IEM3SMDG52GX2NMXC4GQC
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