Index: src/org/openstreetmap/josm/io/ProgressInputStream.java
===================================================================
--- src/org/openstreetmap/josm/io/ProgressInputStream.java	(Revision 1876)
+++ src/org/openstreetmap/josm/io/ProgressInputStream.java	(Arbeitskopie)
@@ -45,6 +45,7 @@
         if (!sizeKnown) {
             progressMonitor.indeterminateSubTask(tr("Downloading OSM data..."));
         }
+        throw new OsmTransferException(new Exception("Test"));
     }
 
     @Override public void close() throws IOException {