Commit does not allow missing email address but whoami says this is allowed

[Aaron Bentley]

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John Arbash Meinel wrote:
> Nicholas Allen wrote:
> 
>>As we are working on an internal closed source system we probably would
>>not want to set our email address.

But even on an internal, closed-source system, you'll want to set it to
something meaningful, because that identifier is used in commit logs.

> All we really care about is having "something at other", it doesn't have to
> be a valid email address. But even that we shouldn't strictly require. I
> tracked down one place that was expecting it, it seems you might be
> running into another.

I think it's a Windows thing.  On Unix, we fall back to the userid at hostname.

Aaron
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