fix(backend): ユーザーのリアクション一覧でミュート/ブロックが機能していなかった問題を修正 (#14100)

* fix: mute/block was not considered on users/reactions

* docs(changelog): update changelog

* chore: Apply suggestion from code review

Co-authored-by: zyoshoka <107108195+zyoshoka@users.noreply.github.com>

---------

Co-authored-by: zyoshoka <107108195+zyoshoka@users.noreply.github.com>

packages/backend/src/misc/is-user-related.ts

@@ -4,6 +4,10 @@
  */
 
 export function isUserRelated(note: any, userIds: Set<string>, ignoreAuthor = false): boolean {
+	if (!note) {
+		return false;
+	}
+
 	if (userIds.has(note.userId) && !ignoreAuthor) {
 		return true;
 	}