Speed up hasCommits check #470
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`git rev-list --all` is very slow for large repositories (order of 5s on a repo with 500k commits). This alternative version works by checking whether HEAD points at a valid commit, by using a git command that returns an error code if not. This means it has to use the 'silentgitignorefailure' version of the git invocation functions, and check for an error.
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git rev-list --allis very slow for large repositories (order of 5s on a repo with 500k commits).This alternative version works by checking whether HEAD points at a valid commit.