Revert "encoding/xml: disallow empty namespace when prefix is set"
This reverts CL 105636.
Reason for revert: Fails with existing XML data. At this stage in the release cycle we should revert, and try again next time with some way to support existing XML.
For #8068
Change-Id: Ia84cbf3a84878ac7190f72998545dee22c36c45e
Reviewed-on: https://go-review.googlesource.com/c/go/+/453996
Auto-Submit: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Heschi Kreinick <heschi@google.com> Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com> Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>