For instance, when aborting a certification: ```bash Do you confirm sending this certification? [y/N]: n Aborted! ERROR:asyncio:Unclosed client session client_session: <aiohttp.client.ClientSession object at 0x7f02f5594348> ERROR:asyncio:Unclosed connector connections: ['[(<aiohttp.client_proto.ResponseHandler object at 0x7f02effd5dc8>, 7239440.848067479)]'] connector: <aiohttp.connector.TCPConnector object at 0x7f02f55a16d8> ``` - [x] `cert` - [x] `tx`: When aborting a transaction. - [ ] #321: Use `with x as y:`?