Sam Rubin, a popular entertainment reporter on KTLA since 1991, died Friday. He was 64. Rubin died at his home of a heart attack. His last appearance on KTLA was on May 9. He did not appear Friday on KTLA’s 7-9 a.m. “Morning News” as usual. KTLA reported that Rubin’s colleagues said he “showed no outward signs of illness” the …