weak: don't panic when calling Value on a zero Pointer Currently weak.Pointer.Value will panic if the weak.Pointer is uninitialized (zero value) which goes against it's documentation. Fix this and add a test. While we're here, also add a test to ensure weak.Make[T](nil) is equivalent to the zero value of weak.Pointer[T]. Fixes #71153. Change-Id: I4d9196026360bc42a5bfcb33ce449131ec251dba Reviewed-on: https://go-review.googlesource.com/c/go/+/641095 Reviewed-by: David Finkel <david.finkel@gmail.com> Auto-Submit: Michael Knyszek <mknyszek@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Carlos Amedee <carlos@golang.org>
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