net: treat a nil *Resolver as a zero one, as documented
Add accessors that handle nil without crashing. Fixes #24330 Change-Id: If5fbbb6015ca8d65f620a06bad6e52de8cd896ad Reviewed-on: https://go-review.googlesource.com/101315 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by:Emmanuel Odeke <emm.odeke@gmail.com>
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