fix comparison to catch deprecated tags with content being ''
fix comparison to catch deprecated tags with content being ''

jack-oquin/catkin,shyamalschandra/catkin,meyerj/catkin,beni55/catkin,scpeters/catkin,asmodehn/catkin,thaddeustaylor/catkin,thaddeustaylor/catkin,thaddeustaylor/catkin,scpeters/catkin,meyerj/catkin,ros/catkin,wkentaro/catkin,harmishhk/catkin,beni55/catkin,ros/catkin,ros/catkin,harmishhk/catkin,asmodehn/catkin,jack-oquin/catkin,beni55/catkin,jack-oquin/catkin,asmodehn/catkin,meyerj/catkin,wkentaro/catkin,wkentaro/catkin,shyamalschandra/catkin,harmishhk/catkin,scpeters/catkin,shyamalschandra/catkin