Remove SLLOS if all speakers with the structure level are interventions or interposed questions

[jsangmeister]

Upon speaker.update, if a speaker is updated from anything other than intervention or interposed_question to one of them and no other speaker for the structure level remains with another speech_state, the related SLLOS should be deleted.

[luisa-beerboom]

Does this also apply for speaker creation/deletion?

i.e. if a speaker is created as an intervention, a SLLoS should not be created and in a normal speaker is deleted, as per #2151 , the structure level should also be deleted if no one has spoken yet and all speakers remaining after that are either interventions or interposed questions

[luisa-beerboom]

Spoke with @jsangmeister : The answer is "yes"

[luisa-beerboom]

Not having a structure_level_list_of_speakers for these speakers would effectively mean that they can't have a structure_level associated with them, so no fraction membership shown in the client for the interposed question.
Do we really want this?
If yes, I think the speaker.create and -update should throw an error if the structure_level_id is set.

What do you think about this @jsangmeister ?

[luisa-beerboom]

Closing because this will be done in the client