Resolve issue with showing Pipeline Occurrences without scanner

This change fixes NoMethodError exception when Pipeline Security tab was
presented with no or broken scanner section.

ee/app/finders/security/pipeline_vulnerabilities_finder.rb

@@ -89,7 +89,7 @@ module Security
         occurrence.vulnerability = vulnerabilities[occurrence.project_fingerprint]
         occurrence.project = pipeline.project
         occurrence.sha = pipeline.sha
-        occurrence.build_scanner(report_occurrence.scanner.to_hash)
+        occurrence.build_scanner(report_occurrence.scanner&.to_hash)
         occurrence.identifiers = report_occurrence.identifiers.map do |identifier|
           Vulnerabilities::Identifier.new(identifier.to_hash)
         end

ee/app/services/security/store_report_service.rb

@@ -54,6 +54,8 @@ module Security
 
     # rubocop: disable CodeReuse/ActiveRecord
     def create_or_find_vulnerability_finding(occurrence, create_params)
+      return if occurrence.scanner.blank?
+
       find_params = {
         scanner: scanners_objects[occurrence.scanner.key],
         primary_identifier: identifiers_objects[occurrence.primary_identifier.key],
@@ -73,6 +75,8 @@ module Security
     end
 
     def update_vulnerability_scanner(occurrence)
+      return if occurrence.scanner.blank?
+
       scanner = scanners_objects[occurrence.scanner.key]
       scanner.update!(occurrence.scanner.to_hash)
     end
@@ -105,7 +109,7 @@ module Security
     def scanners_objects
       strong_memoize(:scanners_objects) do
         @report.scanners.map do |key, scanner|
-          [key, existing_scanner_objects[key] || project.vulnerability_scanners.build(scanner.to_hash)]
+          [key, existing_scanner_objects[key] || project.vulnerability_scanners.build(scanner&.to_hash)]
         end.to_h
       end
     end

ee/changelogs/unreleased/221074-display-vulnerabilities-on-pipeline-security-without-scanners.yml

+---
+title: Display occurrences in Pipeline Security view when scanner information is missing
+merge_request: 35795
+author:
+type: fixed

ee/spec/factories/ci/job_artifacts.rb

@@ -169,6 +169,16 @@ FactoryBot.define do
       end
     end
 
+    trait :sast_with_missing_scanner do
+      file_type { :sast }
+      file_format { :raw }
+
+      after(:build) do |artifact, _|
+        artifact.file = fixture_file_upload(
+          Rails.root.join('ee/spec/fixtures/security_reports/master/gl-sast-missing-scanner.json'), 'application/json')
+      end
+    end
+
     trait :license_management do
       to_create { |instance| instance.save(validate: false) }
 

ee/spec/finders/security/pipeline_vulnerabilities_finder_spec.rb

@@ -10,7 +10,7 @@ RSpec.describe Security::PipelineVulnerabilitiesFinder do
   end
 
   let_it_be(:project) { create(:project, :repository) }
-  let_it_be(:pipeline) { create(:ci_pipeline, :success, project: project) }
+  let_it_be(:pipeline, reload: true) { create(:ci_pipeline, :success, project: project) }
 
   describe '#execute' do
     let(:params) { {} }
@@ -23,7 +23,7 @@ RSpec.describe Security::PipelineVulnerabilitiesFinder do
     let_it_be(:artifact_cs) { create(:ee_ci_job_artifact, :container_scanning, job: build_cs, project: project) }
     let_it_be(:artifact_dast) { create(:ee_ci_job_artifact, :dast, job: build_dast, project: project) }
     let_it_be(:artifact_ds) { create(:ee_ci_job_artifact, :dependency_scanning, job: build_ds, project: project) }
-    let_it_be(:artifact_sast) { create(:ee_ci_job_artifact, :sast, job: build_sast, project: project) }
+    let!(:artifact_sast) { create(:ee_ci_job_artifact, :sast, job: build_sast, project: project) }
 
     let(:cs_count) { read_fixture(artifact_cs)['vulnerabilities'].count }
     let(:ds_count) { read_fixture(artifact_ds)['vulnerabilities'].count }
@@ -299,6 +299,16 @@ RSpec.describe Security::PipelineVulnerabilitiesFinder do
       end
     end
 
+    context 'when scanner is not provided in the report occurrences' do
+      let!(:artifact_sast) { create(:ee_ci_job_artifact, :sast_with_missing_scanner, job: build_sast, project: project) }
+
+      it 'sets empty scanner' do
+        sast_scanners = subject.occurrences.select(&:sast?).map(&:scanner)
+
+        expect(sast_scanners).to all(have_attributes(project_id: nil, external_id: nil, name: nil))
+      end
+    end
+
     def read_fixture(fixture)
       Gitlab::Json.parse(File.read(fixture.file.path))
     end