Joe Tsai 49f8611134 proto: allow nil with Clone
The v1 behavior of Clone returned nil as is.
Replicate this behavior in v2 for easier migration.

Change-Id: I79d93f15dd9913604027e31e5d9ff309e0c2da61
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/220437
Reviewed-by: Damien Neil <dneil@google.com>
2020-02-25 19:13:35 +00:00
..
2020-01-09 18:06:30 +00:00
2020-02-24 22:37:49 +00:00
2020-02-12 19:41:50 +00:00
2020-02-25 19:13:35 +00:00
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