Jearl Miles-Clark, who competed in four Olympics in the 400, 800 or relays, has dropped out of this weekend’s Boston masters indoor nationals, according to a brief note from Jill Geer, USATF chief media maven, who lives in Boston and is covering the event. No reason was given for the scratch. Geer later wrote: “Notified yesterday by (meet director) Steve Vaitones. No reason given that I know of … just her husband emailing Steve to say she’s not coming.”Jearl was among the meet’s chief press attractions. Three days ago, she led this USATF news release.