fix(darkmode): check for null (#1531)

Francisco Gama T. R.

2024-12-03 5a5ef670fee5f5f65981801a7ec9c2e563fe99ad

 quartz/plugins/transformers/links.ts

@@ -65,7 +65,9 @@
                    type: "element",
                    tagName: "svg",
                    properties: {
                      "aria-hidden": "true",
                      class: "external-icon",
                      style: "max-width:0.8em;max-height:0.8em",
                      viewBox: "0 0 512 512",
                    },
                    children: [