Nudge calculation error checking is erroneous since Eva v4

[LouisBrunner]

See:

eva_python_sdk/evasdk/eva_http_client.py

Line 484 in 9674667

return r.json()['nudge']['joints']

and https://docs.automata.tech/v/4.6.0/api/migration-guide/#upgrading-to-400

Starting with Eva v4, nudge won't always return a nudge.joints property on success, we need to make a change to the SDK to either handle the MotionError through exceptions or change the return of the function (breaking change). Consider doing the same for rotate, inverse_kinematics, etc.