Fix budgets zero single view

* Budget component set at zero in view

* Adding suggestion of Alex to patch

decidim-budgets/app/forms/decidim/budgets/admin/budget_form.rb

@@ -16,7 +16,8 @@ class BudgetForm < Decidim::Form
         attribute :decidim_scope_id, Integer
 
         validates :title, translatable_presence: true
-        validates :weight, :total_budget, numericality: { greater_than_or_equal_to: 0 }
+        validates :weight, numericality: { greater_than_or_equal_to: 0 }
+        validates :total_budget, numericality: { greater_than: 0 }
         validates :scope, presence: true, if: ->(form) { form.decidim_scope_id.present? }
         validates :decidim_scope_id, scope_belongs_to_component: true, if: ->(form) { form.decidim_scope_id.present? }
 

decidim-budgets/app/models/decidim/budgets/order.rb

@@ -109,6 +109,7 @@ def can_checkout?
       # enabled
       def budget_percent
         return (total_projects.to_f / maximum_projects) * 100 if projects_rule?
+        return 0 if budget.total_budget.zero?
 
         (total_budget.to_f / budget.total_budget) * 100
       end

decidim-budgets/spec/forms/decidim/budgets/admin/budget_form_spec.rb

@@ -51,6 +51,12 @@
     it { is_expected.not_to be_valid }
   end
 
+  describe "when total_budget is equal to 0" do
+    let(:total_budget) { 0 }
+
+    it { is_expected.not_to be_valid }
+  end
+
   describe "when the scope does not exist" do
     let(:scope_id) { scope.id + 10 }
 

decidim-budgets/spec/system/orders_spec.rb

@@ -121,6 +121,16 @@
           end
         end
       end
+
+      context "when the total budget is zero" do
+        let(:budget) { create(:budget, total_budget: 0, component: component) }
+
+        it "displays total budget" do
+          within ".budget-summary__total" do
+            expect(page).to have_content("TOTAL BUDGET €0")
+          end
+        end
+      end
     end
 
     context "and has not a pending order" do