because of async nature of resize events, ruler element might have been cleared in the previous request, so this ensures we don't get NotFoundError thrown if ruler DOM element was already removed.
Coverage increased (+0.06%) to 93.277% when pulling 618e241b8b4a998ebc9d2c8c5839cfb5b3200c1e on next into 71f3ad0e30b8ad81c3d084a540aed0bcbd85e814 on master.
NotFoundError
thrown if ruler DOM element was already removed.