Treat empty proxy settings as a signal to _not_ use a proxy #449
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When proxy settings are set in Git, an empty value is treated as "do not use a proxy". We update GCM to do the same thing; when an empty value is set, we do not use a proxy.
This allows for the scenario where a proxy has been set globally (unscoped) but a specific (scoped) remote does NOT have a proxy set.
Fixes #442