Make create-tree resilient to missing early-access children (#59968)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: heiskr

src/frame/lib/create-tree.ts

@@ -40,14 +40,18 @@ export default async function createTree(
       }
       // Throw an error if we can't find a content file associated with the children: entry.
       // But don't throw an error if the user is running the site locally and hasn't cloned the Early Access repo.
-      if (originalPath === 'content/early-access') {
+      // Also don't throw for missing children *within* early-access content — a broken
+      // early-access article should not block every docs-internal PR from merging.
+      const msg = `Cannot find a content file at ${originalPath}. Check the 'children' frontmatter in the parent index.md.`
+
+      if (
+        originalPath === 'content/early-access' ||
+        originalPath.startsWith('content/early-access/')
+      ) {
+        console.warn(`Warning: ${msg}`)
         return
       }
-      throw new Error(
-        `Cannot find a content file at ${originalPath}. Fix the children frontmatter entry "/${path.basename(
-          originalPath,
-        )}" in ${path.dirname(originalPath)}/index.md.\n`,
-      )
+      throw new Error(msg)
     }
   }