Hanging Traffic Lights (found in intersections) are undetectable by LiDAR

[webcrawlr]

On these types of traffic lights, lidar points pass right through the traffic lights, only detecting the pole behind the traffic lights. The above image shows a lidar point cloud; the white dots represent background (object id 0), while the black dots are a detected point with a non-zero id. As one can see, the traffic lights on the right are passed through completely, and only registers the buildings behind it. It can also be seen with the forward facing traffic lights, where there is no background and so the lidar registers as empty except for where the pole is. The poles are detected without issue.

Standing, single traffic lights with their own pole do not seem to be affected by this issue.

Tested on CARLA 0.9.11, Windows Version.

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