How to deal with the exception raised from some of Grabbed APIs

[snozawa]

• Some of the APIs like _RestoreKinBody, ResetGrabbed, KinBodyStateSaver, ...etc are implemented : 1) release all grabbed bodies. 2) restore necessary grabbed bodies one by one.
• However, if there is an exception between 1 and 2, all necessary grabbed bodies are gone. Even if the caller side uses try-catch, it's not recoverable.
• For example, some of the robot grabs cameras from the static setting in the scene file. If such robot grab the target workpiece, and this bug happens, all of the cameras are gone, and looks dangerous.
• We'd better not to remove all of the grabbed bodies and need to improve the fallback logic. To do so, we need to determine what's the expected behavior for such case.