removing redundant to_list conversion

Author: xtanion

lib/matplotlib/tests/test_contour.py

@@ -719,6 +719,6 @@ def test_bool_autolevel():
 
 def test_all_nan():
     x = np.array([[np.nan, np.nan], [np.nan, np.nan]])
-    assert_array_almost_equal(plt.contour(x).levels.tolist(),
+    assert_array_almost_equal(plt.contour(x).levels,
                               [-1e-13, -7.5e-14, -5e-14, -2.4e-14, 0.0,
                                 2.4e-14, 5e-14, 7.5e-14, 1e-13])