[SJTC] Make scaling interface optional (backport #1145) #1171
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This way, the controller can be used on systems, where no scaling interface is available (e.g. GZ). The upstream version in ros2_controllers will have the same behavior.
This is a part of fixing UniversalRobots/Universal_Robots_ROS2_GZ_Simulation#57
This is an automatic backport of pull request #1145 done by Mergify.