Changed str in version to be an empty string

Author: alan412

external_samples/rev_touch_sensor.py

@@ -12,7 +12,7 @@ def get_part_number(self) -> str:
     def get_url(self) -> str:  
         return "https://www.revrobotics.com/rev-31-1425/"
     def get_version(self) -> tuple[int, int, str]: 
-        return (1, 0, None)
+        return (1, 0, "")
     def stop(self) -> None:
         pass
     def reset(self) -> None: