change the status code check to 404

This view now works correctly and returns a 404 instead of an empty table.

network_inventory/inventory/tests/test_views.py

@@ -208,7 +208,7 @@ def test_net_detail_view_not_found(create_admin_user):
     client = Client()
     client.login(username="novartis-admin", password="password")
     response = client.get('/net/100/')
-    assert response.status_code == 200 and not_in_content(response, net.name)
+    assert response.status_code == 404
 
 
 def test_backup_detail_view_not_logged_in():