console_conf/models/systems: add method for forgetting the current selection

Signed-off-by: Maciej Borzecki <maciej.zenon.borzecki@canonical.com>

console_conf/models/systems.py

@@ -95,6 +95,9 @@ class RecoverySystemsModel:
     def select(self, system, action):
         self._selection = SelectedSystemAction(system=system, action=action)
 
+    def unselect(self):
+        self._selection = None
+
     @property
     def selection(self):
         return self._selection

console_conf/models/tests/test_systems.py

@@ -209,6 +209,8 @@ class RecoverySystemsModelTests(unittest.TestCase):
                          SelectedSystemAction(
                              system=model.systems[1],
                              action=model.systems[1].actions[0]))
+        model.unselect()
+        self.assertIsNone(model.selection)
 
     def test_to_response_stream(self):
         raw = json.dumps(self.reference)