Scenario: Remove posibility to remove non leaf scenario.

src/Model/Scenarios.py

@@ -16,6 +16,8 @@
 
 # -*- coding: utf-8 -*-
 
+from functools import reduce
+
 from tools import logger_exception
 
 from Model.Tools.PamhyrDict import PamhyrModelDict
@@ -78,3 +80,12 @@ class Scenarios(PamhyrModelDict):
 
         self._dict[key].set_as_deleted()
         self._status.modified()
+
+    def is_leaf(self, scenario):
+        return not reduce(
+            lambda acc, s: (
+                acc or s.parent is scenario
+            ),
+            self._dict.values(),
+            False
+        )