Add empty line

Signed-off-by: Pierre R. Mai <pmai@pmsf.de>

Author: pmai

osi_roadmarking.proto

@@ -105,6 +105,7 @@ message RoadMarking
     // OSI objects: their local z-axis corresponds to how the marking is placed
     // on the xy-plane of the lane, rather than pointing upwards as it does for
     // other objects.
+
     optional string model_reference = 6;
 
     //