git config error message

Hello,

git config --get issues an error message when the specified value
contains a section that does not exist, but does not issue any message
when the value contains a key that does not exist while in both cases
returning a status 1. E.g.

$ git config --get xxx
error: key does not contain a section: xxx

$ git config --get xxx.yyy

Proposal: to issue an error message also when the key does not exist.

-Angelo Borsotti