As shown in the attached file, text markup is not used when no OS Class is found. I think that this patch should resolve the issue.
--- ScanHostDetailsPage.py 2006-08-24 19:59:38.000000000 +0200
+++ ScanHostDetailsPage.py-patched 2007-03-20 09:21:52.000000000 +0100
@@ -282,8 +282,8 @@
self.portsused_expander.add(hbox)
def set_osclass(self, osclass):
+.
2007-03-20 08:22:47 UTC in umit