The C++ MoveGroup's plan function [returns an error code](http://docs.ros.org/kinetic/api/moveit_tutorials/html/doc/move_group_interface/move_group_interface_tutorial.html#planning-to-a-pose-goal), but the Python MoveGroupCommander's [plan function](http://docs.ros.org/jade/api/moveit_commander/html/classmoveit__commander_1_1move__group_1_1MoveGroupCommander.html#a18b673b333ff75be6186619577e75b84) seems to return only the RobotTrajectory. Am I misunderstanding it? What is the best way to check in Python if a motion plan was successful?
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