cmi: add empty line between packages for better readability
cmi: add empty line between packages for better readability

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