fix: frontmatter coercion (empty string is falsy)

Jacky Zhao

2023-12-09 2c69b0c97d40f76363d20478cb799ce4b7518e56

 quartz/styles/base.scss

@@ -64,7 +64,7 @@
    color: var(--tertiary) !important;
  }

  &.internal {
  &.internal:not(:has(> img)) {
    text-decoration: none;
    background-color: var(--highlight);
    padding: 0 0.1rem;