Check if response is an Error (#4)

Author: luis-camero

robotiq_modbus_rtu/src/robotiq_modbus_rtu/comModbusRtu.py

@@ -101,6 +101,10 @@ def getStatus(self, numBytes):
       #   print("Failed to receive status")
         return None
 
+      if response.isError():
+        print(response)
+        return None
+
       #Instantiate output as an empty list
       output = []