fix runtime error if there is no camera info
fix runtime error if there is no camera info

ros-naoqi/naoqi_bridge,ArthurVal/RIDDLE_naoqi_bridge,ArthurVal/RIDDLE_naoqi_bridge,vrabaud/naoqi_bridge,ros-naoqi/naoqi_bridge,suryaambrose/naoqi_bridge,suryaambrose/naoqi_bridge,lsouchet/naoqi_bridge,vrabaud/naoqi_bridge,lsouchet/naoqi_bridge