Issue #3377310 by catch, joelpittet, mark_fullmer, smustgrave, TrevorBradley,...

Issue #3377310 by catch, joelpittet, mark_fullmer, smustgrave, TrevorBradley, bkosborne, MWaters, cilefen, capellic: 400 exceptions result from requests for old asset paths which are missing the "theme" query string, possibly from cached pages