Avoid error if no history folder

[azlux]

During the docker manual start, we only need the /data folder mount volume. So /config and /addon_configs/cf6b56a3_linky doesn't not exist.

/linky # node --trace-exit --trace-uncaught --experimental-modules dist/index.js
HA Linky is starting
Connection with Home Assistant established
PRM 05182489143190 found in configuration for consumption
[01/03 10:59] New PRM detected, historical consumption data import is starting
Cannot find folder /addon_configs/cf6b56a3_linky
TypeError: Cannot read properties of undefined (reading 'length')
(node:110) WARNING: Exited the environment with code 1
    at exit (node:internal/process/per_thread:197:13)
    at file:///linky/dist/index.js:106:13
    at processTicksAndRejections (node:internal/process/task_queues:95:5)

So I've change this line to have no error.

Best regards Azlux

[bokub]

Thanks a lot!