Merge pull request #321 from plugwise/impr-312

Catch error from #312

Author: bouwew

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Ongoing
 
+- PR [321](https://github.com/plugwise/python-plugwise-usb/pull/321): Catch error reported in Issue [#312](https://github.com/plugwise/plugwise_usb-beta/issues/312)
 - PR [319](https://github.com/plugwise/python-plugwise-usb/pull/319): Replace unclear warning message when a node is not online, also various small improvements suggested by CRAI.
 - PR [312](https://github.com/plugwise/python-plugwise-usb/pull/312): properly propagate configuration changes and initialize to available on first node wakeup
 

plugwise_usb/helpers/util.py

@@ -13,8 +13,12 @@
 
 def validate_mac(mac: str) -> bool:
     """Validate the supplied string is in a MAC address format."""
-    if not re.match("^[A-F0-9]+$", mac):
+    try:
+        if not re.match("^[A-F0-9]+$", mac):
+            return False
+    except TypeError:
         return False
+
     try:
         _ = int(mac, 16)
     except ValueError: