moved extracting the attributes into PlotDescription

grum/mainwin.py

@@ -136,7 +136,7 @@ class MainWindow(QMainWindow):
         data = {}
         for name, item in self.lst.items.items():
             desc = item.value
-            data[name] = {k: v for k, v in desc.__dict__.items() if not k.startswith("_") and k != "name" and v is not None}
+            data[name] = desc.to_dict()
 
         write_dict(fn, data)
 

grum/plotdesc.py

@@ -36,4 +36,8 @@ class PlotDescription:
         return res
 
 
+    def to_dict(self):
+        return {k: v for k, v in self.__dict__.items() if not k.startswith("_") and k != "name" and v is not None}
+
+