Change default Vendor name to GitLab when not defined in the report

ee/changelogs/unreleased/210327-disable-parsing-empty-vendor.yml

+---
+title: Change default vendor name to GitLab if not defined in the security schema
+merge_request: 36519
+author:
+type: fixed

ee/lib/gitlab/ci/reports/security/scanner.rb

@@ -18,13 +18,11 @@ module Gitlab
           end
 
           def to_hash
-            %i[
-              external_id
-              name
-              vendor
-            ].each_with_object({}) do |key, hash|
-              hash[key] = public_send(key).to_s # rubocop:disable GitlabSecurity/PublicSend
-            end
+            {
+              external_id: external_id.to_s,
+              name: name.to_s,
+              vendor: vendor.presence
+            }.compact
           end
 
           def ==(other)

ee/spec/lib/gitlab/ci/reports/security/scanner_spec.rb

@@ -61,6 +61,17 @@ RSpec.describe Gitlab::Ci::Reports::Security::Scanner do
         vendor: scanner.vendor
       })
     end
+
+    context 'when vendor is not defined' do
+      let(:scanner) { create(:ci_reports_security_scanner, vendor: nil) }
+
+      it 'returns expected hash' do
+        is_expected.to eq({
+          external_id: scanner.external_id,
+          name: scanner.name
+        })
+      end
+    end
   end
 
   describe '#==' do