Simplify PseudoVirtualList (#93)

Possible fix for #92

routes/_components/pseudoVirtualList/PseudoVirtualList.html

@@ -1,5 +1,4 @@
 <div class="pseudo-virtual-list" on:initialized ref:node>
-  {{#if wrappedItems}}
   {{#each wrappedItems as wrappedItem, i @item}}
     <PseudoVirtualListLazyItem
       component="{{component}}"
@@ -13,7 +12,6 @@
       height="{{getHeight(wrappedItem.item, $intersectionStates)}}"
     />
   {{/each}}
-  {{/if}}
 </div>
 <style>
   .pseudo-virtual-list {
@@ -107,7 +105,7 @@
       }
     },
     computed: {
-      wrappedItems: (items) => items && items.map(item => ({item: item})),
+      wrappedItems: (items) => items ? items.map(item => ({item})) : [],
       allItemsHaveHeight: (items, $intersectionStates) => {
         if (!items) {
           return false