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A recent fix to pass through command line arguments to the ros node initialized within gazebo exposes this problem; by correctly namespacing the gazebo node with the name declared in the launch script. The spawn_model script defaults to look for gazebo services under /gazebo/ namespace, and thus fails and the gazebo node operating under /empty_world_server/(spawn_urdf_model, etc.).
The fix you suggested above is valid. Alternatively, one could also pass the additional commandline argument of gazebo_namespace to the spawn_model script, e.g.
rosrun gazebo spawn_model -gazebo_namespace empty_world_server -...
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