Merge pull request #2704 from PolicyEngine/fix/remove-markdown-for-ai

Use conditional chaining to prevent MarkdownFormatter breakage

Author: anth-volk

src/layout/MarkdownFormatter.jsx

@@ -319,7 +319,7 @@ export function MarkdownFormatter({ markdown, backgroundColor, dict, pSize }) {
               .props.children.find(
                 (child) => child?.props?.node.tagName === "a",
               ).props.node.properties.href;
-            value = footnoteLinkBack.split("-").pop();
+            value = footnoteLinkBack?.split("-").pop() || "";
             validValue = /^-?\d+$/.test(value);
           } catch (e) {
             // Do nothing
@@ -369,7 +369,7 @@ export function MarkdownFormatter({ markdown, backgroundColor, dict, pSize }) {
           // If href=#user-content-fn-1, id should be user-content-fnref-1 and vice versa
           if (href.startsWith("#user-content-fn-")) {
             id = href.replace("#user-content-fn-", "user-content-fnref-");
-            footnoteNumber = parseInt(id.split("-").pop());
+            footnoteNumber = parseInt(id?.split("-").pop() || "0");
           } else if (href.startsWith("#user-content-fnref-")) {
             id = href.replace("#user-content-fnref-", "user-content-fn-");
           } else {
@@ -475,7 +475,7 @@ export function MarkdownFormatter({ markdown, backgroundColor, dict, pSize }) {
           }
         },
         h2: ({ children: headerText }) => {
-          if (!headerText.split) {
+          if (!headerText?.split) {
             headerText = "";
           }
           // Remove slashes and commas, and replace spaces with dashes to create a