infobox: fix error when gateway could not be resolved
infobox: fix error when gateway could not be resolved

gherber/hopglass,gherber/hopglass,srauscher/hopglass,plumpudding/hopglass,Freifunk-Luxembourg/hopglass,srauscher/hopglass,Freifunk-Luxembourg/hopglass,plumpudding/hopglass,hopglass/hopglass,hopglass/hopglass