Fix com_google_fonts_check_037: HTML report may not exist
Fix com_google_fonts_check_037: HTML report may not exist

FontVal may not create a HTML report, test for it before removing it.

graphicore/fontbakery,moyogo/fontbakery,graphicore/fontbakery,googlefonts/fontbakery,googlefonts/fontbakery,googlefonts/fontbakery,moyogo/fontbakery,graphicore/fontbakery,moyogo/fontbakery