Open should only return close on success #396
Merged
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Config assumes that Open will always return a close function
which causes a panic when Open returns an error, since it doesn't
return a close function.
We can instead clean up the assumption that we return partial values
on error, and instead use a more common pattern:
err == nil
and all other return values are validerr != nil
and all other return values are zero valuesFixes #390.