--- a/eric6/Graphics/UMLDiagramBuilder.py	Wed May 05 17:29:41 2021 +0200
+++ b/eric6/Graphics/UMLDiagramBuilder.py	Wed May 05 18:17:24 2021 +0200
@@ -70,3 +70,12 @@
         @rtype bool
         """
         return True
+    
+    def toDict(self):
+        """
+        Public method to collect data to be persisted.
+        
+        @return dictionary containing data to be persisted
+        @rtype dict
+        """
+        return {}