Fix issue with notification queue that prevented to properly close projects. Fix #1493

gns3server/handlers/api/compute/notification_handler.py

@@ -44,15 +44,17 @@ class NotificationHandler:
 
         request.app['websockets'].add(ws)
         asyncio.ensure_future(process_websocket(ws))
-        with notifications.queue() as queue:
-            try:
+
+        try:
+            with notifications.queue() as queue:
                 while True:
                     notification = await queue.get_json(1)
                     if ws.closed:
                         break
                     await ws.send_str(notification)
-            finally:
-                if not ws.closed:
-                    await ws.close()
-                request.app['websockets'].discard(ws)
+        finally:
+            if not ws.closed:
+                await ws.close()
+            request.app['websockets'].discard(ws)
+
         return ws