Fix build errors due to undefined access (#764)

* add undefined guard

* add length check for better static typing

client/src/app/bookings/page.tsx

@@ -15,18 +15,20 @@ const BookingPage = async () => {
    * We assume there will be only one based on the way {@link LodgeInformation}
    * is set up in sanity
    */
-  const lodgeInfoSingleton = lodgeInfo[0]
+  const lodgeInfoSingleton: LodgeInformation | undefined =
+    // However this can only be a singleton if the list is non-empty
+    lodgeInfo.length > 0 ? lodgeInfo[0] : undefined
 
   const RenderedContent = () => {
     return (
-      lodgeInfoSingleton.information && (
+      lodgeInfoSingleton?.information && (
         <PortableText value={lodgeInfoSingleton.information} />
       )
     )
   }
 
   const processedImages =
-    lodgeInfoSingleton.imageUrls?.map((item) =>
+    lodgeInfoSingleton?.imageUrls?.map((item) =>
       item.url
         ? new SanityImageUrl(item.url).autoFormat().width(700).toString()
         : ""