handle nils safely
handle nils safely

R=rsc
DELTA=38  (14 added, 10 deleted, 14 changed)
OCL=19242
CL=19242

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