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Program crashes with eye matrix as an input

matrix2.txt:

running:

$ ./matr2scheme ../matrix2.txt 
Программа для разложения унитарной матрицы на произведение двухуровневых матриц.
Автор: Довжиков Сергей

Исходная матрица:
1  0  0  0  
0  1  0  0  
0  0  1  0  
0  0  0  1  

Результат (по Нильсен, Чанг):
Проверка равенства произведения матриц исходной:
Exception in thread "main" java.lang.UnsupportedOperationException: empty.reduceLeft
	at scala.collection.LinearSeqOptimized.reduceLeft(LinearSeqOptimized.scala:139)
	at scala.collection.LinearSeqOptimized.reduceLeft$(LinearSeqOptimized.scala:138)
	at scala.collection.immutable.List.reduceLeft(List.scala:89)
	at scala.collection.TraversableOnce.reduce(TraversableOnce.scala:211)
	at scala.collection.TraversableOnce.reduce$(TraversableOnce.scala:211)
	at scala.collection.AbstractTraversable.reduce(Traversable.scala:108)
	at quant.tools.Runner$.runAlg(Runner.scala:42)
	at quant.tools.Runner$.$anonfun$new$2(Runner.scala:102)
	at quant.tools.Runner$.$anonfun$new$2$adapted(Runner.scala:102)
	at scala.util.Either.fold(Either.scala:191)
	at quant.tools.Runner$.delayedEndpoint$quant$tools$Runner$1(Runner.scala:102)
	at quant.tools.Runner$delayedInit$body.apply(Runner.scala:14)
	at scala.Function0.apply$mcV$sp(Function0.scala:39)
	at scala.Function0.apply$mcV$sp$(Function0.scala:39)
	at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:17)
	at scala.App.$anonfun$main$1$adapted(App.scala:80)
	at scala.collection.immutable.List.foreach(List.scala:392)
	at scala.App.main(App.scala:80)
	at scala.App.main$(App.scala:78)
	at quant.tools.Runner$.main(Runner.scala:14)
	at quant.tools.Runner.main(Runner.scala)