fix: ensure code exists inside pre before adding clipboard

Jacky Zhao

2023-08-20 7b7064ad2be68e8d6d43123c12529ca94a325fcb

 quartz/plugins/filters/index.ts

@@ -1,2 +1,2 @@
export { RemoveDrafts } from './draft'
export { ExplicitPublish } from './explicit'
export { RemoveDrafts } from "./draft"
export { ExplicitPublish } from "./explicit"