CanBusMotionControl: do not raise error if motorPwmLimit is not found

[traversaro]

If motorPwmLimit is not found, the default limit of 1333 is used instead, and a warning is printed.
For this reason, it does not make sense to print an error if motorPwmLimit is not found.

[traversaro]

cc @xEnVrE @randaz81

[randaz81]

The reason why is set to Error is because I originally wanted to avoid optional parameters (keeping them temporarily for backward compatibility) and proceed to fix all robot configuration files until all of them have the same set of parameters, and no optional values. This allows to perform easily automatic search and replace operation via xquery. This policy may be reconsidered now, if you wish.

[pattacini]

Thanks for the rationale @randaz81 👍

My hunch is that we could proceed further anyhow without waiting for the big overhaul to be completed. Soon afterward, we'll be able to get back to this.

How do you see that?

[randaz81]

Ok! I'd suggest to keep an issue open on that, because optional/default values already caused weird issues in the past...

[pattacini]

Let me open up an issue in robots-configuration @randaz81