Undefined array key "commit"

Hi All,
Since I’m using tt-rss without docker, I’m facing this error:

Undefined array key "commit"
1. classes/config.php(316): ttrss_error_handler(Undefined array key "commit", classes/config.php)
2. prefs.php(173): get_version_html()

Since _get_version() doesn’t return ‘commit’ key in any situation, we should manage to replace ‘commit’ key if it doesn’t exist.

return sprintf("<span title=\"%s\n%s\n%s\">%s</span>",
				date("Y-m-d H:i:s", ($version['timestamp'] ?? 0)),
					$version['commit'] ?? '',
					$version['branch'] ?? '',
					$version['version']);