Bug 40942: Hide the 'Contacts' block if nothing to display

If there is no contact we should hide the "Contacts" block on the "show"
view.

Fixes VueFramework_spec.ts
AssertionError: Timed out retrying after 10000ms: Expected to find content: 'Contracts' within the element: <fieldset.rows> but never did.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/js/vue/components/Vendors/VendorResource.vue

@@ -788,6 +788,7 @@ export default {
             return [
                 {
                     name: $__("Contacts"),
+                    hidden: vendor => !!vendor.contacts?.length,
                     showElement: {
                         type: "table",
                         columnData: "contacts",