Consider adding empty collision tag to urdf

When starting moveit with VLP-16.urdf.xacro or HDL-32E.urdf.xacro from this package I get the following warnings

[ WARN] [1662985569.203748831] [/move_group]: Link velodyne has visual geometry but no collision geometry. Collision geometry will be left empty. Fix your URDF file by explicitly specifying collision geometry.

This can be avoided by adding a dummy collision element to the link

<collision>
  <geometry>
    <sphere radius="0"/>
  </geometry>
</collision>

Like I have done here: https://bitbucket.org/fsund/velodyne_simulator/commits/917723097f7712bf0eeba54fd4abd7266cc98c7b

(Perhaps a cube with size 0 is better for collision checking when I think about it)

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