fix regression when not using user_cblack (#285)

Author: letmaik

rawpy/_rawpy.pyx

@@ -1242,7 +1242,7 @@ class Params(object):
             assert len(user_cblack) == 4
             self.user_cblack = user_cblack
         else:
-            self.user_cblack = [0, 0, 0, 0]
+            self.user_cblack = None
         self.user_sat = user_sat if user_sat is not None else -1
         self.no_auto_bright = no_auto_bright
         self.no_auto_scale = no_auto_scale

rawpy/_version.py

@@ -1 +1 @@
-__version__ = "0.26.0"
+__version__ = "0.26.1"

test/test_user_cblack.py

@@ -1,10 +1,7 @@
 """Tests for per-channel black level corrections (user_cblack parameter)."""
-from __future__ import division, print_function, absolute_import
-
 import os
 import pytest
 import numpy as np
-from numpy.testing import assert_array_equal
 
 import rawpy
 
@@ -20,7 +17,7 @@ def test_user_cblack_parameter_acceptance():
 
     # Test with None (default)
     params = rawpy.Params()
-    assert params.user_cblack == [0, 0, 0, 0]
+    assert params.user_cblack is None
 
 
 def test_user_cblack_parameter_validation():