cleanup

proxtoolbox/Problems/OrbitalTomog/Graphics/stack_viewer.py

@@ -68,6 +68,9 @@ class XYZStackViewer:
 
         if cmap is not None:
             show_colorbar = True
+        else:
+            show_colorbar = False
+
         if data_transform is not None:
             self.cast_fn = data_transform
         elif iscomplexobj(volume):