Fix opus comparison with None

pylast.py

@@ -1738,6 +1738,8 @@ class _Opus(_BaseObject, _Taggable):
             self.get_artist().get_name(), self.get_title())
 
     def __eq__(self, other):
+        if type(self) != type(other):
+            return False
         a = self.get_title().lower()
         b = other.get_title().lower()
         c = self.get_artist().get_name().lower()
@@ -1745,6 +1747,8 @@ class _Opus(_BaseObject, _Taggable):
         return (a == b) and (c == d)
 
     def __ne__(self, other):
+        if type(self) != type(other):
+            return True
         a = self.get_title().lower()
         b = other.get_title().lower()
         c = self.get_artist().get_name().lower()

test_pylast.py

@@ -1804,6 +1804,23 @@ class TestPyLast(unittest.TestCase):
         self.assertEqual(url, "http://www.last.fm/place/italy")
 
 
+    def test_track_eq_none_is_false(self):
+        # Arrange
+        track1 = None
+        track2 = pylast.Track("Test Artist", "Test Title", self.network)
+
+        # Act / Assert
+        self.assertFalse(track1 == track2)
+
+    def test_track_ne_none_is_true(self):
+        # Arrange
+        track1 = None
+        track2 = pylast.Track("Test Artist", "Test Title", self.network)
+
+        # Act / Assert
+        self.assertTrue(track1 != track2)
+
+
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(
         description="Integration (not unit) tests for pylast.py",