smach_viewer/test add test_smach_event.py,

[k-okada]

Test code and temporary fixes? Ignore? code.
#59 (comment)

I think the root cause is that roseus_samch pickle.l does not understand that nil is a list.

-   (cond ((listp obj)
+   (cond ((and (listp obj) (not (null obj)))

Also, the initial value of userdata of roseus_smach/src/state-machine-utils.l is incorrect.

-(defun exec-state-machine (sm &optional (mydata '(nil))
+(defun exec-state-machine (sm &optional (mydata '((nil)))