Update notion.js

Author: craigary

lib/notion.js

@@ -40,7 +40,7 @@ export async function getAllPosts() {
     property.id = block.id.split('-').join('')
     property.fullWidth = block?.format?.page_full_width ?? false
     const date = block.properties?.[dateSchema]
-    property.date = getDateValue(date)?.start_date
+    property.date = getDateValue(date)?.start_date || null
     const tagArr = getPageProperty('tags', block, recordMap)
     property.tags = !tagArr.length ? null : tagArr.split(',')
     acc.push(property)