Update Stick properties mac_stick, mac_coordinator and name

Author: bouwew

plugwise_usb/__init__.py

@@ -130,18 +130,27 @@ def hardware(self) -> str:
         return self._controller.hardware_stick
 
     @property
-    def mac_stick(self) -> str:
-        """MAC address of USB-Stick. Raises StickError is connection is missing."""
+    def mac_stick(self) -> str | None:
+        """MAC address of USB-Stick.
+        
+        Returns None when the connection to the Stick fails.
+        """
         return self._controller.mac_stick
 
     @property
-    def mac_coordinator(self) -> str:
-        """MAC address of the network coordinator (Circle+). Raises StickError is connection is missing."""
+    def mac_coordinator(self) -> str | None:
+        """MAC address of the network coordinator (Circle+).
+        
+        Returns none when there is no connection, not paired, not present in the network.
+        """
         return self._controller.mac_coordinator
 
     @property
-    def name(self) -> str:
-        """Return name of Stick."""
+    def name(self) -> str | None:
+        """Return name of Stick.
+        
+        Returns None when the connection to the Stick fails.
+        """
         return self._controller.stick_name
 
     @property