@Test
    public void testEmpty() {
        assertTrue(LogUtils.empty(null));
        assertTrue(LogUtils.empty(""));
        assertFalse(LogUtils.empty("f"));
        assertFalse(LogUtils.empty("fo"));
        assertFalse(LogUtils.empty("foo"));
    }
@author Ulf Lilleengen
@author Bjorn Borud
vespalog/src/test/java/com/yahoo/log/impl/LogUtilsTest.java