Checker: Add study geometry checker.

src/Model/Network/Edge.py

@@ -53,6 +53,9 @@ class Edge(object):
     def name(self):
         return self._name if self._name != "" else f"{self.node1.name} -> {self.node2.name}"
 
+    def is_enable(self):
+        return self._enable
+
     def enable(self, enable=True):
         self._enable = enable
         self._status.modified()