fix: frontmatter coercion (empty string is falsy)

Jacky Zhao

2023-12-09 2c69b0c97d40f76363d20478cb799ce4b7518e56

 quartz.config.ts

@@ -69,6 +69,7 @@
      }),
      Plugin.Assets(),
      Plugin.Static(),
      Plugin.NotFoundPage(),
    ],
  },
}