python/test: fix

unittest/python/version.py

@@ -9,6 +9,8 @@ class TestVersion(TestCase):
     def test_version(self):
       print("version:",pin.__version__)
       print("raw_version:",pin.__raw_version__)
+      self.assertTrue(pin.__version__)
+      self.assertTrue(pin.__raw_version__)
 
 if __name__ == '__main__':
     unittest.main()