Conditionally render checkout div based on metadata presence.

Added an *ngIf directive to the checkout-wrapper div to ensure it is only displayed when metadata is present. This helps in preventing errors and improving user experience by showing relevant content conditionally.

archigator/src/app/main/main.component.html

@@ -1,6 +1,6 @@
 <!--<app-header></app-header>-->
 
-<div class="checkout-wrapper">
+<div class="checkout-wrapper" *ngIf="hasMetadata; else noMetadata">
 
     <div class="checkout-main">