apycot-moved #5267 disabled missing vcs lib [rejected]

Apycot should simply disable unavailable repository type if the AGENT can't be imported instead of crashing.
Corresponding unit test should then be skipped.
Checker or test requiring such repository should failed with a meaningful reason.

priorityminor
typebug
done in<not specified>
load0.200
load left0.000
closed by<not specified>