NullPointerException in method sumOutVariable (DiscretePotentialOperations)

[Manuel Luque]

When running the JUnit test testEvaluationIDDiagnosisProblem (class org.openmarkov.inference.variableElimination.VariableEliminationTest) the method sumOutVariable (class DiscretePotentialOperations) throws a NullPointerException because newUtilityPotential.interventions is null in line 1782 of class DiscretePotentialOperations.