Fix blank alert field with vuln issue

ee/app/controllers/ee/projects/issues_controller.rb

@@ -62,7 +62,7 @@ module EE
           errors << render_vulnerability_link_alert(error)
         end
 
-        flash[:alert] = errors.join('<br\>').html_safe
+        flash[:alert] = errors.join('<br\>').html_safe unless errors.blank?
       end
 
       def vulnerability

ee/changelogs/unreleased/fix_blank_alert_from_vuln_issue.yml

+---
+title: Fix blank alert field when creating an issue from a vulnerability
+merge_request: 53656
+author:
+type: fixed

ee/spec/controllers/projects/issues_controller_spec.rb

@@ -127,6 +127,10 @@ RSpec.describe Projects::IssuesController do
             expect(issue.confidential).to be false
           end
 
+          it 'does not show an error message' do
+            expect(flash[:alert]).to be_nil
+          end
+
           context 'when vulnerability already has a linked issue' do
             render_views