Fix crash when deleting conversation

        disposables += markUnarchived

        disposables += deleteConversations

        val partsObservable = messageRepo.getPartsForConversation(threadId)

                .asObservable()

                .filter { parts -> parts.isLoaded && parts.isValid}

        disposables += Observables

                .combineLatest(conversation, partsObservable) { conversation, parts ->

                .combineLatest(

                        conversation,

                        messageRepo.getPartsForConversation(threadId).asObservable()

                ) { conversation, parts ->

                    val data = mutableListOf<ConversationInfoItem>()

                    // If some data was deleted, this isn't the place to handle it

                    if (!conversation.isLoaded || !conversation.isValid || !parts.isLoaded || !parts.isValid) {

                        return@combineLatest

                    }

                    data += conversation.recipients.map(::ConversationInfoRecipient)

                    data += ConversationInfoItem.ConversationInfoSettings(

                            name = conversation.name,