Check that normalization_array is a numpy array

nabu/reconstruction/sinogram.py

@@ -309,9 +309,9 @@ class SinoNormalization:
     def _set_kind(self, kind, normalization_array):
         check_supported(kind, self.kinds, "sinogram normalization kind")
         self.normalization_kind = kind
-        if "array" in kind and normalization_array is None:
+        if "array" in kind and not isinstance(normalization_array, np.ndarray):
             raise ValueError(
-                "Expected 'normalization_array' to be provided for normalization kind='%s'" % kind
+                "Expected 'normalization_array' to be provided as a numpy array for normalization kind='%s'" % kind
             )
         self.normalization_array = normalization_array