[FIX] hw_scanner: avoid flooding logs

When no devices are connected, avoid errors
No such file or directory: '/dev/input/by-id/'

addons/hw_scanner/controllers/main.py

@@ -122,6 +122,9 @@ class Scanner(Thread):
             if not evdev:
                 return None
 
+            if not os.path.isdir(self.input_dir):
+                return None
+
             new_devices = [device for device in listdir(self.input_dir)
                            if join(self.input_dir, device) not in [dev.evdev.fn for dev in self.open_devices]]
             scanners = [device for device in new_devices