Comment an empty block which is ok

Change-Id: I552d4481e17a12b0bd707d5386f29026ae0856fb

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/ReflogResolveTest.java

@@ -152,6 +152,7 @@ public class ReflogResolveTest extends RepositoryTestCase {
 			db.resolve("@{-1}@{0}");
 			fail();
 		} catch (RevisionSyntaxException e) {
+			// good
 		}
 		assertEquals(c1.getName(), db.resolve("@{-2}@{0}").getName());