fix display. Behaviour for motion remains compatible.

python/MXMotion.py

@@ -44,7 +44,6 @@ class MotionBase:
        sync_wait can be put in the program to force a timing sync
        sync_run are the commands to run the whole program
        '''
-    gpascii = self.comm.gpascii
     if mode == 0:
       try:
         del self.sync_prg
@@ -83,7 +82,10 @@ while(1)
 disable plc {plcId}
 close
 '''.format(plcId=plcId, crdId=crdId, flag=flag)
-      gpascii.send_block(prg)
+      comm=self.comm
+      if comm is not None:
+        gpascii=comm.gpascii
+        gpascii.send_block(prg)
       self.sync_prg = 'Coord[{crdId}].DesTimeBase=0'.format(prgId=prgId, plcId=plcId, crdId=crdId)
       self.sync_run = 'enable plc {plcId};&{crdId}b{prgId}r'''.format(prgId=prgId, plcId=plcId, crdId=crdId)