Add Shop module at end of Location page

With linked poster if existing, otherwise with all products

src/components/organisms/ShopModule.svelte

@@ -25,7 +25,7 @@
     export let url: string = '/shop'
     export let enabled: boolean = true
 
-    if (textBottom !== null && textBottom !== undefined) {
+    if (textBottom !== null) {
         textBottom = `Posters available for ${locationsWithPoster.join(', ').replace(/,(?!.*,)/gmi, ' and')}.`
     }