Make matrix appear off when deleted

Author: chrisruk

buildhat/devices.py

@@ -67,6 +67,8 @@ def _setup(device="/dev/serial0"):
 
     def __del__(self):
         if hasattr(self, "port") and Device._used[self.port]:
+            if self._typeid == 64:
+                self.clear()
             Device._used[self.port] = False
             self._conn.callit = None
             self.deselect()