tree fca635edc0de11e6c28212926a91b0f128e0d1e1
parent d8bc21f7e13fa476be55b17983bd5d43ad8c7121
author Joe Tsai <joetsai@digital-static.net> 1587146119 -0700
committer Joe Tsai <joetsai@digital-static.net> 1587424376 +0000

all: consistently treat nil message interface as an empty read-only message

To assist users in migrating from github.com/golang/protobuf
to google.golang.org/protobuf, make it such that functiionality like
proto.Marshal doesn't panic on nil interfaces.

Similar to how the new implementation treats a typed nil message
as an empty message, we treat a nil interface as being equivalent
to an "untyped" empty message.

Change-Id: Ic037f386f855b122f732b34d370e524b7c0d76f1
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/228837
Reviewed-by: Damien Neil <dneil@google.com>