fix coverage of overlays, and mark a not implemented

exception as no cover..

ui/cli.py

@@ -334,7 +334,7 @@ def main():
 						del obj[k]
 				nobj = MDBase(obj)
 				objstr.loadobj(nobj)
-	else:
+	else: # pragma: no cover
 		raise NotImplementedError
 
 	objstr.store(storefname)
@@ -453,10 +453,10 @@ class _TestCases(unittest.TestCase):
 
 		# and that when you get it's properties
 		oobj = objst.by_id(oid)
-		oitems = oobj.items()
+		odict = dict(oobj.items())
 
 		# that is has the overlays property
-		print `oitems`
+		self.assertEqual(odict['overlay_refs'], [ bid ])
 
 	def test_objectstore(self):
 		objst = ObjectStore.load(os.path.join('fixtures', 'sample.data.pasn1'))