gmoccapy: Fixed Inappropriate Logical Expression (#2769)

Author: hansu

src/emc/usr_intf/gmoccapy/gmoccapy.py

@@ -5505,8 +5505,9 @@ def _button_pin_changed(self, pin):
             LOG.debug("Received a not classified signal from pin {0}".format(pin.name))
             return
 
-        number = int(pin.name[-1])
-        if number is not number:
+        try:
+            number = int(pin.name[-1])
+        except:
             LOG.debug("Could not translate {0} to number".format(pin.name))
             return