Merge pull request #45 from ankon/imageio-jpeg-test-null

Avoid NPE when the expected tree is indeed null

imageio/imageio-jpeg/src/test/java/com/twelvemonkeys/imageio/plugins/jpeg/JPEGImageReaderTest.java

@@ -965,6 +965,7 @@ public class JPEGImageReaderTest extends ImageReaderAbstractTestCase<JPEGImageRe
 
         if (expectedTree == null) {
             assertNull(actualTree);
+            return;
         }
 
         assertEquals(String.format("%s: Node names differ", message), expectedTree.getNodeName(), actualTree.getNodeName());