To prevent later NPEs, throw an error if the input value is null in Default Configurator

src/de/tud/kom/p2psim/impl/scenario/DefaultConfigurator.java

@@ -867,10 +867,13 @@ public class DefaultConfigurator implements Configurator {
 	@SuppressWarnings("unchecked")
 	public static <T extends Number> T parseNumber(String value,
 			Class<T> targetClass) {
-		assert value != null;
+		//assert value != null;
 
-		if(value == null)
-			System.out.println("");
+		if(value == null) {
+			System.out.println(targetClass);
+			throw new UnsupportedOperationException("[DefaultConfigurator]: value cannot be null! " );
+						
+		}
 
 		String number = value;
 		double factor = 1;