adds validation for custom dates in advanced search

avoids error 500 on invalid dates

app/controllers/concerns/commentable_actions.rb

@@ -129,16 +129,16 @@ module CommentableActions
       when '4'
         1.year.ago
       else
-        Date.parse(params[:advanced_search][:date_min]) rescue nil
+        Date.parse(params[:advanced_search][:date_min]) rescue 100.years.ago
       end
     end
 
     def search_finish_date
-      params[:advanced_search][:date_max].try(:to_date) || Date.today
+      (params[:advanced_search][:date_max].to_date rescue Date.today) || Date.today
     end
 
     def search_date_range
-      search_start_date.beginning_of_day..search_finish_date.end_of_day
+      [100.years.ago, search_start_date].max.beginning_of_day..[search_finish_date, Date.today].min.end_of_day
     end
 
     def set_search_order

spec/features/debates_spec.rb

@@ -640,6 +640,28 @@ feature 'Debates' do
           end
         end
 
+        scenario "Search by custom invalid date range", :js do
+          debate1 = create(:debate, created_at: 2.years.ago)
+          debate2 = create(:debate, created_at: 3.days.ago)
+          debate3 = create(:debate, created_at: 9.days.ago)
+
+          visit debates_path
+
+          click_link "Advanced search"
+          select "Customized", from: "js-advanced-search-date-min"
+          fill_in "advanced_search_date_min", with: "9"
+          fill_in "advanced_search_date_max", with: "444444444"
+          click_button "Filter"
+
+          within("#debates") do
+            expect(page).to have_css('.debate', count: 3)
+
+            expect(page).to have_content(debate1.title)
+            expect(page).to have_content(debate2.title)
+            expect(page).to have_content(debate3.title)
+          end
+        end
+
         scenario "Search by multiple filters", :js do
           ana  = create :user, official_level: 1
           john = create :user, official_level: 1

spec/features/proposals_spec.rb

@@ -980,6 +980,28 @@ feature 'Proposals' do
           end
         end
 
+        scenario "Search by custom invalid date range", :js do
+          proposal1 = create(:proposal, created_at: 2.days.ago)
+          proposal2 = create(:proposal, created_at: 3.days.ago)
+          proposal3 = create(:proposal, created_at: 9.days.ago)
+
+          visit proposals_path
+
+          click_link "Advanced search"
+          select "Customized", from: "js-advanced-search-date-min"
+          fill_in "advanced_search_date_min", with: 4000.years.ago
+          fill_in "advanced_search_date_max", with: "wrong date"
+          click_button "Filter"
+
+          expect(page).to have_content("There are 3 citizen proposals")
+
+          within("#proposals") do
+            expect(page).to have_content(proposal1.title)
+            expect(page).to have_content(proposal2.title)
+            expect(page).to have_content(proposal3.title)
+          end
+        end
+
         scenario "Search by multiple filters", :js do
           ana  = create :user, official_level: 1
           john = create :user, official_level: 1