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java.lang.UnsupportedOperationException: empty.reduceLeft	at scala.collection.TraversableOnce$class.reduceLeft(TraversableOnce.scala:180)	at scala.collection.mutable.ArrayBuffer.scala$collection$IndexedSeqOptimized$$super$reduceLeft(ArrayBuffer.scala:48)	at scala.collection.IndexedSeqOptimized$class.reduceLeft(IndexedSeqOptimized.scala:74)	at scala.collection.mutable.ArrayBuffer.reduceLeft(ArrayBuffer.scala:48)	at scala.collection.TraversableOnce$class.reduce(TraversableOnce.scala:208)	at scala.collection.AbstractTraversable.reduce(Traversable.scala:104)	at upickle.Macros$Reading.mergeTrait(Macros.scala:77)	at derive.Derive.deriveTrait(Derive.scala:298)	at derive.Derive$$anonfun$9.apply(Derive.scala:237)	at derive.Derive$$anonfun$9.apply(Derive.scala:235)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)	at scala.collection.immutable.Map$Map2.foreach(Map.scala:137)	at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)	at scala.collection.AbstractTraversable.map(Traversable.scala:104)	at derive.Derive.deriveType(Derive.scala:235)	at derive.Derive.derive(Derive.scala:60)	at upickle.Macros$.macroRImpl(Macros.scala:145)