title: Idiomatic scala for getting a single option out of two Options and throwing exception if two are available
body: <pre><code>val one: Option[Int] = None    
  val two = Some(2)
  
  Option(one.getOrElse(two.getOrElse(null))) // Gives me Some(2) which I want
  
  val one = Some(1)
  val two = None
  
  Option(one.getOrElse(two.getOrElse(null))) // Gives me Some(1) which I want
  
  val one: Option[Int] = None
  val two: Option[Int] = None
  
  Option(one.getOrElse(two.getOrElse(null))) // Gives me None which I want
  
  val one = Some(1)
  val two = Some(2)
  
  Option(one.getOrElse(two.getOrElse(null))) // Gives me Some(1) when I want an exception
  </code></pre>
  
  <p>I briefly looked into the Either type but it seems like it is for "Representing a value of one of two possible types".  Am I missing some data structure or Monad?  Essentially I want a explicit (and error throwing if both are valuable) get either one if it avaiable or get None</p>