CatDogRecognition example fails with NPE

[swpalmer]

After label and training files are accessed successfully, there is an attempt to access a null File.

INFO: Creating neural network...
Exception in thread "main" java.lang.NullPointerException
at java.base/java.io.FileInputStream.(FileInputStream.java:145)
at java.base/java.io.FileReader.(FileReader.java:75)
at deepnetts.util.FileIO.createFromJson(FileIO.java:196)
at javax.visrec.ri.spi.BufferedImageClassifierFactory.create(BufferedImageClassifierFactory.java:47)
at javax.visrec.spi.ClassifierFactoryService.createNeuralNetImageClassifier(ClassifierFactoryService.java:55)
at javax.visrec.ml.classification.NeuralNetImageClassifier$Builder.build(NeuralNetImageClassifier.java:167)
at jsr381.example.CatDogRecognition.main(CatDogRecognition.java:35)