Do not try to display discarded products/variants.

app/models/spree/wishlist.rb

@@ -1,6 +1,9 @@
 class Spree::Wishlist < ActiveRecord::Base
   belongs_to :user, class_name: 'Spree::User'
   has_many :wished_products, dependent: :destroy
+  has_many :visible_wished_products,
+    -> { joins(:variant).where(spree_variants: {deleted_at: nil}) },
+    class_name: "Spree::WishedProduct"
   before_create :set_access_hash
 
   validates :name, presence: true

app/views/spree/wishlists/show.html.erb

@@ -23,8 +23,8 @@
     </tr>
   </thead>
   <tbody id="line_items">
-  <% if @wishlist.wished_products.size > 0 %>
-    <% @wishlist.wished_products.each do |wish|
+  <% if @wishlist.visible_wished_products.size > 0 %>
+    <% @wishlist.visible_wished_products.each do |wish|
         variant = wish.variant
         product = variant.product %>
     <tr class="<%= cycle('', 'alt') %>">

spec/features/spree/wishlist_spec.rb

@@ -47,6 +47,34 @@
       sign_in_as! user
     end
 
+    context 'show', :focus do
+      background do
+        wishlist.wished_products << Spree::WishedProduct.new(variant: product.master)
+      end
+
+      context 'wishlist has a current product' do
+        scenario 'it displays the product' do
+          visit spree.account_path
+          click_link wishlist.name
+
+          expect(page).to have_content(product.name)
+        end
+      end
+
+      context 'wishlist has a discarded product' do
+        background do
+          product.discard
+        end
+
+        scenario 'it does not display the product' do
+          visit spree.account_path
+          click_link wishlist.name
+
+          expect(page).to_not have_content(product.name)
+        end
+      end
+    end
+
     context 'edit' do
       scenario 'edit a wishlists name' do
         visit_edit_wishlist