Fixed highlight history link test now that empty values are handled s…

…pecifically and are not in the ignorableHistoryComments()

src/imio/history/tests/test_documentbylineviewlet.py

@@ -42,8 +42,8 @@ def test_highlight_history_link(self):
         adapter = getAdapter(self.portal.doc, IImioHistory, 'workflow')
         # not highlighted because '' is an ignored comment
         history = adapter.getHistory()
+        self.assertFalse(history[-1]['comments'])
         self.assertFalse(self.viewlet.highlight_history_link())
-        self.assertTrue(history[-1]['comments'] in adapter.ignorableHistoryComments())
 
         # now 'publish' the doc and add a comment, last event has a comment
         self.wft.doActionFor(self.portal.doc, 'publish', comment='my publish comment')