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Lin Junrong
732a12108e
Four kinematic processor steps read the observation as
observation = self.transition.get(TransitionKey.OBSERVATION).copy()
if observation is None:
raise ValueError("Joints observation is require for computing robot kinematics")
so `.copy()` runs first and the guard below it is unreachable. A transition
without an observation raises `AttributeError: 'NoneType' object has no
attribute 'copy'` instead of the intended message.
That transition is not hypothetical: `RobotProcessorPipeline.process_action`
builds one with `create_transition(action=action)`, which sets
`TransitionKey.OBSERVATION` to None.
Reads the value first, checks it, then copies. Affects EEReferenceAndDelta,
InverseKinematicsEEToJoints, GripperVelocityToJoint and InverseKinematicsRLStep.
Adds a parametrised regression test covering all four; each fails with the
AttributeError if the fix is reverted.
Co-authored-by: Steven Palma <imstevenpmwork@ieee.org>