By Jennifer Newton & Emma Mackenzie It is somewhat of a bittersweet Easter for the royals this year – for more reasons than one. While King Charles confirmed ahead of time that he and Queen Camilla would be attending the annual Windsor church service marking the holy weekend, his appearance is very much still the exception to the rule, as he remains away from most “public-facing duties” as he undergoes treatment for cancer, per the advice of his medical team. Despite the King’s attendance, there are some notable absences, with Prince William and Princess Kate both missing out on the service an…