Allow model arithmetic without parent masks

spacetelescope · Aug 30, 2017 · fbcf893 · fbcf893
1 parent d8cf354
commit fbcf893
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/specviz/core/data.py b/specviz/core/data.py
@@ -479,7 +479,7 @@ def parent_mask(self):
         -------
 
         """
-        if self.mask is None or self._parent.layer_mask is None:
+        if self.mask is None or self._parent is None or self._parent.layer_mask is None:
             return np.zeros(self._data.shape)
 
         return self.mask.astype(bool) | ~self._parent.layer_mask.astype(bool)