Make parameter in actions.notificationBuilder() optional

[mueller-ma]

Most of my notifications only contain a title as IMO it looks better on Android to have a title than a message. Thus most times I pass an empty string to actions.notificationBuilder(""). Maybe this parameter could be made optional with "" as default value.

[mueller-ma]

I discovered that the parameter is actually optional. When using it without a parameter, it crashes the Android app, but that's a different issue (openhab/openhab-android#3794).

[florian-h05]

It was actually not planned that this is supported, rather works by coincidence.
I have just checked the add-on code, null for message is not supported by still works in the cloud connector code.

But I think it would be better to pass an empty string, WDYT?
And it has to be marked as optional in the JSDoc.

[florian-h05]

See #370.

[mueller-ma]

But I think it would be better to pass an empty string, WDYT?

Yes, because that will also work with all clients.