tools: add a noop notify() function to all our classes

ratbagd uses GObjects and properties so we also make use of notify() a
fair bit. Make sure we don't crash out in ratbagc for that, just add an empty
noop function named notify()

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

tools/ratbagc.py.in

@@ -51,6 +51,10 @@ class MetaRatbag(type):
         c = type.__new__(cls, name, bases, dct)
         if "__late_init__" in dct:
             c.__late_init__()
+
+        # Add a noop self.notify() so we're compatible with GObjects
+        c.notify = lambda *args : None
+
         return c