Fix product's validation on welcome screen

src/lib/installation/clients/inst_complex_welcome.rb

@@ -84,6 +84,10 @@ def handle_ret(ret)
 
       when :next
         return nil unless Language.CheckIncompleteTranslation(@language)
+        if selected_product.nil?
+          Yast::Popup.Error(_("Please select a product to install."))
+          return nil
+        end
         setup_final_choice
         merge_and_run_workflow if selected_product
         :next

src/lib/installation/dialogs/complex_welcome.rb

@@ -77,7 +77,7 @@ def contents
       #
       # @return [::Installation::Widgets::ProductSelector]
       def product_selector
-        ::Installation::Widgets::ProductSelector.new(products)
+        ::Installation::Widgets::ProductSelector.new(products, skip_validation: true)
       end
 
       # Product license widget

src/lib/installation/widgets/product_selector.rb

@@ -13,9 +13,11 @@ class ProductSelector < CWM::RadioButtons
       attr_reader :product
 
       # @param products [Array<Installation::Product>] to display
-      def initialize(products)
+      # @param skip_validation [Boolean] Skip value validation
+      def initialize(products, skip_validation: false)
         @products = products
         @items = products.map { |p| [p.name, p.label] }
+        @skip_validation = skip_validation
         textdomain "installation"
       end
 
@@ -49,11 +51,18 @@ def store
       end
 
       def validate
-        return true if value
+        return true if value || skip_validation?
 
         Yast::Popup.Error(_("Please select a product to install."))
         false
       end
+
+      # Determine whether the validation should be skipped
+      #
+      # @see #initialize
+      def skip_validation?
+        @skip_validation
+      end
     end
   end
 end