PHILADELPHIA — The Central Bucks School Board in Pennsylvania scrapped a planned ninth-grade trip to Washington to visit the Holocaust Museum and other sites after a board member objected to city vaccine requirements that she said could exclude some students. “I think we’re discriminating against children who are not vaccinated,” Lisa Sciscio said during a board meeting Tuesday night, voicing concern about COVID-19 vaccine requirements in Washington restaurants and the prospect of children being turned away from using indoor restrooms. While “I love Washington, D.C.,” she said, she suggested a…