fix: polls should be safe to resume

addons/majority_judgment/nodes/MajorityJudgmentLinearResultsControl.gd

@@ -225,18 +225,14 @@ func start_provider(__provider):
 	__provider.start_providing()
 
 
-var known_participants := Dictionary()  # id => Participant
-
 func get_or_create_participant(identifier:String) -> MajorityJudgmentParticipant:
-	if not known_participants.has(identifier):
-		known_participants[identifier] = MajorityJudgmentParticipant.make(identifier)
-	return known_participants[identifier]
+	return get_poll().get_or_create_participant(identifier)
 
 
 var __save_mutex := Mutex.new()  # perhaps overzealous
 
 func __on_judgment_emitted(author_identifier, grade_index, candidate_index):
-	# Data comes from userland, best be careful here
+	# Data comes from userland, best be extra careful in here
 	if (
 		grade_index < 0
 		or