Currently, `commit.gpgsign` allows you to give either 'true' or 'false' as a 
value. If the key is not present, commits will fail:

$ git commit -m "example"
error: gpg failed to sign the data
fatal: failed to write commit object

I like to reuse my config file across several machines, some of which do not 
have my GPG key. Would it be possible to add an option to sign the commit only 
if the private key for `user.signingkey` is present? It could be named 
something like `commit.gpgsign=default-yes`.

Thank you for your time,
Joshua Nelson

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