'stg edit' aborts on empty patch description; add instructions. #143
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This resolves #138 by...
From conversation on #138 it became
clear that aborting the 'edit' on an empty editor is correct. This behavior
mirrors 'git commit' and 'stg squash'.
Previously, if a user cleared the 'stg edit' editor window, the patch
description would be cleared. This is unintuative! Users likely expect that
this would abort the edit instead.