Do not try to auto-complete vulnerabilities if the user is nil

Changelog: fixed
EE: true

ee/app/finders/autocomplete/vulnerabilities_autocomplete_finder.rb

@@ -20,7 +20,7 @@ module Autocomplete
     DEFAULT_AUTOCOMPLETE_LIMIT = 5
 
     def execute
-      return ::Vulnerability.none unless vulnerable.feature_available?(:security_dashboard)
+      return ::Vulnerability.none unless current_user && vulnerable.feature_available?(:security_dashboard)
 
       ::Security::VulnerabilitiesFinder # rubocop: disable CodeReuse/Finder
         .new(vulnerable)

ee/spec/finders/autocomplete/vulnerabilities_autocomplete_finder_spec.rb

@@ -7,64 +7,73 @@ RSpec.describe Autocomplete::VulnerabilitiesAutocompleteFinder do
     let_it_be(:group, refind: true) { create(:group) }
     let_it_be(:project, refind: true) { create(:project, group: group) }
     let_it_be(:vulnerability) { create(:vulnerability, project: project) }
-    let(:params) { {} }
 
-    let_it_be(:user) { create(:user) }
+    let(:params) { {} }
 
     subject { described_class.new(user, vulnerable, params).execute }
 
     shared_examples 'autocomplete vulnerabilities finder' do
-      context 'when user does not have access to project' do
+      context 'when the given user is nil' do
+        let(:user) { nil }
+
         it { is_expected.to be_empty }
       end
 
-      context 'when user has access to project' do
-        before do
-          vulnerable.add_developer(user)
-        end
+      context 'when the given user is not nil' do
+        let_it_be(:user) { create(:user) }
 
-        context 'when security dashboards are not enabled' do
+        context 'when user does not have access to project' do
           it { is_expected.to be_empty }
         end
 
-        context 'when security dashboards are enabled' do
+        context 'when user has access to project' do
           before do
-            stub_licensed_features(security_dashboard: true)
+            vulnerable.add_developer(user)
           end
 
-          it { is_expected.to match_array([vulnerability]) }
+          context 'when security dashboards are not enabled' do
+            it { is_expected.to be_empty }
+          end
 
-          context 'when multiple vulnerabilities are found' do
+          context 'when security dashboards are enabled' do
             before do
-              create_list(:vulnerability, 10, project: project)
+              stub_licensed_features(security_dashboard: true)
             end
 
-            it 'returns max 5 items' do
-              expect(subject.count).to eq(5)
-            end
+            it { is_expected.to match_array([vulnerability]) }
 
-            it 'is sorted descending by id' do
-              expect(subject).to be_sorted(:id, :desc)
-            end
-          end
+            context 'when multiple vulnerabilities are found' do
+              before do
+                create_list(:vulnerability, 10, project: project)
+              end
 
-          context 'when search is provided in params' do
-            context 'and it matches ID of vulnerability' do
-              let(:params) { { search: vulnerability.id.to_s } }
+              it 'returns max 5 items' do
+                expect(subject.count).to eq(5)
+              end
 
-              it { is_expected.to match_array([vulnerability]) }
+              it 'is sorted descending by id' do
+                expect(subject).to be_sorted(:id, :desc)
+              end
             end
 
-            context 'and it matches title of vulnerability' do
-              let(:params) { { search: vulnerability.title } }
+            context 'when search is provided in params' do
+              context 'and it matches ID of vulnerability' do
+                let(:params) { { search: vulnerability.id.to_s } }
 
-              it { is_expected.to match_array([vulnerability]) }
-            end
+                it { is_expected.to match_array([vulnerability]) }
+              end
+
+              context 'and it matches title of vulnerability' do
+                let(:params) { { search: vulnerability.title } }
+
+                it { is_expected.to match_array([vulnerability]) }
+              end
 
-            context 'and it does not match neither title or id of vulnerability' do
-              let(:params) { { search: non_existing_record_id.to_s } }
+              context 'and it does not match neither title or id of vulnerability' do
+                let(:params) { { search: non_existing_record_id.to_s } }
 
-              it { is_expected.to be_empty }
+                it { is_expected.to be_empty }
+              end
             end
           end
         end