CLDC-4105: Ensure hhmemb is not >8 for validation (#3184)

otherwise the send to ecstatn will fail

this can happen whilst running validation checks

app/models/validations/soft_validations.rb

@@ -329,6 +329,8 @@ private
   end
 
   def at_least_one_person_working_situation_is_illness?
+    return if hhmemb.present? && hhmemb > 8
+
     person_count = hhmemb || 8
 
     (1..person_count).any? { |n| public_send("ecstat#{n}") == 8 }