system.part_log can not be created 

The `system.part_log` table was not created on version `19.14.6.12` even with the following config.

```
  <part_log>
    <database>system</database>
    <table>part_log</table>
    <partition_by>toYYYYMM(event_date)</partition_by>
    <flush_interval_milliseconds>7500</flush_interval_milliseconds>
  </part_log>
```

No related logs.