[touchwand] - better handle unit update when currStatus key is null (#10520)

[touchwand] - better handle unit update when currStatus key is null (#10520)

* notify listeners on status change using discovery

Signed-off-by: Roie Geron <roie.geron@gmail.com>
* adapt bridge discovery name to new string broadcast

Signed-off-by: Roie Geron <roie.geron@gmail.com>
* check correctly if current status key is not null

Signed-off-by: Roie Geron <roie.geron@gmail.com>
* change log from warn to debug

Signed-off-by: Roie Geron <roie.geron@gmail.com>
* better handle when currStatus is null

also move logs from warn to debug

Signed-off-by: Roie Geron <roie.geron@gmail.com>
* remove nonNullByDefault annotation

as dto can be null

Signed-off-by: Roie Geron <roie.geron@gmail.com>