[issue88] return a better error code/message when ~/.gnupg doesn't exist and/or the agent isn't running

[Marc Mutz]

New submission from Marc Mutz <marc at klaralvdalens-datakonsult.se>:

Currently, "general error" is returned. The message for the new error code 
should be something along the lines of "No gpg-agent instance found.".

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messages: 364
nosy: david, marc, werner
priority: minor bug
status: unread
title: return a better error code/message when ~/.gnupg doesn't exist and/or the agent isn't running
topic: gpgsm
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Aegypten issue tracker <aegypten-issues at intevation.de>
<https://intevation.de/roundup/aegypten/issue88>
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