Unexpected exception for products with empty path content

java.io.FileNotFoundException: .../PDL/receiver_storage/heartbeat/lenore/prod01-pdl01.cr.usgs.gov/1612887003529 (Is a directory)
        at java.io.FileInputStream.open0(Native Method)
        at java.io.FileInputStream.open(FileInputStream.java:195)
        at java.io.FileInputStream.<init>(FileInputStream.java:138)
        at gov.usgs.util.StreamUtils.getInputStream(StreamUtils.java:60)
        at gov.usgs.earthquake.product.FileContent.getInputStream(FileContent.java:136)
        at gov.usgs.earthquake.product.AbstractContent.getSha256(AbstractContent.java:154)
        at gov.usgs.earthquake.product.AbstractContent.getSha256(AbstractContent.java:140)
        at gov.usgs.earthquake.product.ProductDigest.onContent(ProductDigest.java:137)
        at gov.usgs.earthquake.product.io.ObjectProductSource.sendContents(ObjectProductSource.java:142)
        at gov.usgs.earthquake.product.io.ObjectProductSource.streamTo(ObjectProductSource.java:60)
        at gov.usgs.earthquake.product.ProductDigest.digestProduct(ProductDigest.java:96)
        at gov.usgs.earthquake.product.Product.verifySignatureKey(Product.java:397)
        at gov.usgs.earthquake.distribution.SignatureVerifier.verifySignature(SignatureVerifier.java:149)
        at gov.usgs.earthquake.distribution.FileProductStorage.storeProductSource(FileProductStorage.java:642)
        at gov.usgs.earthquake.distribution.DefaultNotificationReceiver.storeProductSource(DefaultNotificationReceiver.java:443)
        at gov.usgs.earthquake.distribution.DefaultNotificationReceiver.retrieveProduct(DefaultNotificationReceiver.java:337)
        at gov.usgs.earthquake.distribution.NotificationEvent.getProduct(NotificationEvent.java:65)
        at gov.usgs.earthquake.distribution.DefaultNotificationListener.onNotification(DefaultNotificationListener.java:119)
        at gov.usgs.earthquake.distribution.NotificationListenerCallable.call(NotificationListenerCallable.java:34)
        at gov.usgs.earthquake.distribution.NotificationListenerCallable.call(NotificationListenerCallable.java:10)
        at gov.usgs.util.ExecutorTask.run(ExecutorTask.java:183)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
WARNING thread=1281     [receiver_aws_east] exception while retrieving product, file not found