Graph: Minor change.

src/Model/Network/Graph.py

@@ -54,7 +54,7 @@ class Graph(SQLSubModel):
     def _enable_edges(self):
         """Return a generator"""
         return filter(
-            lambda e: e.is_enable(),
+            lambda e: e.is_enable() and not e.is_deleted(),
             self.edges()
         )