JS Tidy check fails for new files

The newly introduced check for tidy js files fails if the js file is branch new. We run the run_checks in the before test and that then fails to read_file as it doesn't yet exist.

Processing files before patches
|==========>              |  5 / 12 (41.67%)

An error occurred : read_file '/kohadevbox/koha/koha-tmpl/intranet-tmpl/lib/dayjs/plugin/isSameOrBefore.js' - open: No such file or directory at /kohadevbox/qa-test-tools/QohA/File/JS.pm line 20.