codereview: add golang-dev@googlegroups.com     automatically in "hg mail". also, avoid "empty list means all modified files in client" bug
codereview: add golang-dev@googlegroups.com
    automatically in "hg mail".
also, avoid "empty list means all modified files in client" bug

R=gri, cw
CC=golang-dev
http://codereview.appspot.com/174072

nightlyone/golang,bdwalton/debian-golang,gnanderson/go,nightlyone/golang,ssrl/go,nightlyone/golang,h8liu/golang,pombredanne/go-deleteme,nightlyone/golang,pombredanne/go-deleteme,tianon/debian-golang,tv42/old-go,apparentlymart/golang,gnanderson/go,h8liu/golang,ssrl/go,dsriram/golang,nightlyone/golang,gnanderson/go,bdwalton/debian-golang,tv42/old-go,gnanderson/go,nightlyone/golang,bdwalton/debian-golang,pombredanne/go-deleteme,pombredanne/go-deleteme,ssrl/go,tianon/debian-golang,h8liu/golang,bdwalton/debian-golang,apparentlymart/golang,tv42/old-go,apparentlymart/golang,h8liu/golang,h8liu/golang,gnanderson/go,bdwalton/debian-golang,h8liu/golang,bdwalton/debian-golang,ssrl/go,dsriram/golang,pombredanne/go-deleteme,ssrl/go,tianon/debian-golang,ssrl/go,bdwalton/debian-golang,apparentlymart/golang,tv42/old-go,tv42/old-go,bdwalton/debian-golang,nightlyone/golang,dsriram/golang,tianon/debian-golang,apparentlymart/golang,tianon/debian-golang,tv42/old-go,h8liu/golang,tianon/debian-golang,pombredanne/go-deleteme,dsriram/golang,dsriram/golang,gnanderson/go,tianon/debian-golang,apparentlymart/golang,ssrl/go,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,dsriram/golang,tianon/debian-golang,dsriram/golang,gnanderson/go