Do not send project closed event when it's a snapshot restore

Ref #602

tests/controller/test_snapshot.py

@@ -17,7 +17,7 @@
 
 import os
 import pytest
-from unittest.mock import patch
+from unittest.mock import patch, MagicMock
 
 from gns3server.controller.project import Project
 from gns3server.controller.snapshot import Snapshot
@@ -90,9 +90,14 @@ def test_restore(project, controller, async_run):
     assert os.path.exists(test_file)
     assert len(project.nodes) == 2
 
+    controller._notification = MagicMock()
     with patch("gns3server.config.Config.get_section_config", return_value={"local": True}):
         async_run(snapshot.restore())
 
+    # project.closed notification should not be send when restoring snapshots
+    assert "project.closed" not in [c[0][0] for c in controller.notification.emit.call_args_list]
+
+
     project = controller.get_project(project.id)
     assert not os.path.exists(test_file)
     assert len(project.nodes) == 1