[innogysmarthome] NullPointerException fixed which could occur when no device state...

[innogysmarthome] NullPointerException fixed which could occur when no device state is available (#9660) (#9677)

* [innogysmarthome] Bug-fix - NPE solved which could occur when devices without a corresponding device state were returned by the API. That happened with the virtual device "NotificationSender" which is unimportant for the binding.

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] JavaDoc fixed

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimizations (warnings fixed)

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code refactoring (InnogyClient class split to make it smaller)

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization ; Potential bug with the reachable attribute solved (it was set multiple times within a loop)

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Tests added

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Tests added

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code changed to not overwrite the reachable state provided by the API (when no corresponding message is available)

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Copyright notice updated

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
* [innogysmarthome] Code and performance optimization

Signed-off-by: Sven Strohschein <sven.strohschein@gmail.com>
Co-authored-by: Sven Strohschein <sven.strohschein@gmail.com>