config: Try to create the logs directory before setting up error logs.

poezio/config.py

@@ -594,6 +594,12 @@ def setup_logging():
     LOG_DIR = config.get('log_dir')
     LOG_DIR = Path(LOG_DIR).expanduser() if LOG_DIR else xdg.DATA_HOME / 'logs'
     if config.get('log_errors'):
+        try:
+            LOG_DIR.mkdir(parents=True, exist_ok=True)
+        except OSError:
+            # We can’t really log any error here, because logging isn’t setup yet.
+            pass
+        else:
             LOGGING_CONFIG['root']['handlers'].append('error')
             LOGGING_CONFIG['handlers']['error'] = {
                 'level': 'ERROR',