code review 87960043: goprotobuf: Handle nils in repeated message fields in t...

goprotobuf: Handle nils in repeated message fields in text formatting.

Previously this code would panic. A nil in a repeated message field is,
strictly speaking, invalid, but text formatting is often used for debugging,
and it's much more useful to generate "<nil>" than to panic.

[dsymonds, 2014-04-15 04:37:16]

Hello r (cc: golang-codereviews@googlegroups.com),

I'd like you to review this change to
https://code.google.com/p/goprotobuf

[r, 2014-04-15 07:16:59]

LGTM

[dsymonds, 2014-04-15 08:22:28]

*** Submitted as
https://code.google.com/p/goprotobuf/source/detail?r=ec8a922f81f6 ***

goprotobuf: Handle nils in repeated message fields in text formatting.

Previously this code would panic. A nil in a repeated message field is,
strictly speaking, invalid, but text formatting is often used for debugging,
and it's much more useful to generate "<nil>" than to panic.

LGTM=r
R=r
CC=golang-codereviews
https://codereview.appspot.com/87960043