Fix codequality empty base report

lib/gitlab/ci/reports/reports_comparer.rb

@@ -8,6 +8,7 @@ module Gitlab
 
         STATUS_SUCCESS = 'success'
         STATUS_FAILED = 'failed'
+        STATUS_NOT_FOUND = 'not_found'
 
         attr_reader :base_report, :head_report
 
@@ -17,7 +18,13 @@ module Gitlab
         end
 
         def status
-          success? ? STATUS_SUCCESS : STATUS_FAILED
+          if success?
+            STATUS_SUCCESS
+          elsif base_report.nil? || head_report.nil?
+            STATUS_NOT_FOUND
+          else
+            STATUS_FAILED
+          end
         end
 
         def success?

spec/lib/gitlab/ci/reports/reports_comparer_spec.rb

@@ -45,6 +45,30 @@ RSpec.describe Gitlab::Ci::Reports::ReportsComparer do
         expect(status).to eq('failed')
       end
     end
+
+    context 'when base_report is nil' do
+      let(:base_report) { nil }
+
+      before do
+        allow(comparer).to receive(:success?).and_return(false)
+      end
+
+      it 'returns status not_found' do
+        expect(status).to eq('not_found')
+      end
+    end
+
+    context 'when head_report is nil' do
+      let(:head_report) { nil }
+
+      before do
+        allow(comparer).to receive(:success?).and_return(false)
+      end
+
+      it 'returns status not_found' do
+        expect(status).to eq('not_found')
+      end
+    end
   end
 
   describe '#success?' do