--data-path gives AssertionError

[brunakov]

Describe the bug
Using the --data-path switch gives the following error:

DEBUG: pantalaimon: UI loop received message UpdateUsersMessage(server='local-matrix', user_id='@test:test.com', device_id='FEWFFFEWT')
Error handling request
Traceback (most recent call last):
  File "/home/test/matrix-pantalaimon/venv/lib/python3.8/site-packages/aiohttp/web_protocol.py", line 422, in _handle_request
    resp = await self._request_handler(request)
  File "/home/test/matrix-pantalaimon/venv/lib/python3.8/site-packages/aiohttp/web_app.py", line 499, in _handle
    resp = await handler(request)
  File "/home/test/matrix-pantalaimon/venv/lib/python3.8/site-packages/pantalaimon/daemon.py", line 680, in login
    await self.start_pan_client(
  File "/home/test/matrix-pantalaimon/venv/lib/python3.8/site-packages/pantalaimon/daemon.py", line 629, in start_pan_client
    self.store.save_access_token(
  File "/home/test/matrix-pantalaimon/venv/lib/python3.8/site-packages/nio/store/database.py", line 40, in inner
    return fn(self, *args, **kwargs)
  File "/home/test/matrix-pantalaimon/venv/lib/python3.8/site-packages/pantalaimon/store.py", line 395, in save_access_token
    assert account
AssertionError

To Reproduce
Steps to reproduce the behavior:
run pantalaimon with pantalaimon --data-path some_path

Desktop (please complete the following information):
Ubuntu 20.04 server

Additional context
pantalaimon, version 0.9.3