show full error report if not enough errors

- if errors summary table is empty as below threshold
- send users to full report
- remove the back button so they cannot access summary report

app/mailers/bulk_upload_mailer.rb

@@ -46,6 +46,12 @@ class BulkUploadMailer < NotifyMailer
   def send_correct_and_upload_again_mail(bulk_upload:)
     error_description = "We noticed that you have a lot of similar errors in column #{columns_with_errors(bulk_upload:)}. Please correct your data export and upload again."
 
+    summary_report_link = if BulkUploadErrorSummaryTableComponent.new(bulk_upload:).errors?
+                            summary_bulk_upload_lettings_result_url(bulk_upload)
+                          else
+                            bulk_upload_lettings_result_url(bulk_upload)
+                          end
+
     send_email(
       bulk_upload.user.email,
       BULK_UPLOAD_FAILED_CSV_ERRORS_TEMPLATE_ID,
@@ -55,7 +61,7 @@ class BulkUploadMailer < NotifyMailer
         year_combo: bulk_upload.year_combo,
         lettings_or_sales: bulk_upload.log_type,
         error_description:,
-        summary_report_link: summary_bulk_upload_lettings_result_url(bulk_upload),
+        summary_report_link:,
       },
     )
   end

app/views/bulk_upload_lettings_results/show.html.erb

@@ -1,5 +1,7 @@
-<% content_for :before_content do %>
+<% if BulkUploadErrorSummaryTableComponent.new(bulk_upload: @bulk_upload).errors? %>
+  <% content_for :before_content do %>
     <%= govuk_back_link(text: "Back", href: summary_bulk_upload_lettings_result_path(@bulk_upload)) %>
+  <% end %>
 <% end %>
 
 <div class="govuk-grid-row">

spec/mailers/bulk_upload_mailer_spec.rb

@@ -93,7 +93,7 @@ RSpec.describe BulkUploadMailer do
             year_combo: bulk_upload.year_combo,
             lettings_or_sales: bulk_upload.log_type,
             error_description: "We noticed that you have a lot of similar errors in column A, B. Please correct your data export and upload again.",
-            summary_report_link: "http://localhost:3000/lettings-logs/bulk-upload-results/#{bulk_upload.id}/summary",
+            summary_report_link: "http://localhost:3000/lettings-logs/bulk-upload-results/#{bulk_upload.id}",
           },
         )
 
@@ -103,6 +103,8 @@ RSpec.describe BulkUploadMailer do
 
     context "when 4 columns with errors" do
       before do
+        stub_const("BulkUploadErrorSummaryTableComponent::DISPLAY_THRESHOLD", 0)
+
         create(:bulk_upload_error, bulk_upload:, col: "A")
         create(:bulk_upload_error, bulk_upload:, col: "B")
         create(:bulk_upload_error, bulk_upload:, col: "C")