Rasa: Validate domain file for repeat intents, entities, slots

[erohmensing]

sql for rasa-x does not like this. we should validate on training and also before upload to rasa x.

[erohmensing]

currently in rasa, you can have templates with no - text properly if they don't have any other properties, as they just get turned into text ones in the processing. But this throws an issue when loading the domain into rasa x: https://forum.rasa.com/t/error-while-running-rasa-x-command/10173

I think the better way to handle this is to just deprecate the ability to provide templates without the text attribute, instead of also working to handle this in rasa x

[tmbo]

Why isn't rasa x just using the rasa way of loading the domain, normalizing it on the way?

[erohmensing]

@tmbo i have no idea, you'd have to ask whoever implemented that in rasa x

[tmbo]

I guess that might be @ricwo

[erohmensing]

@tabergma this can be closed right?

[tabergma]

closed via https://github.com/RasaHQ/rasa/pull/3601