Handle errors due to Cloudwatch retention in monthly report (LG-11320)

lib/reporting/monthly_proofing_report.rb

@@ -78,6 +78,11 @@ def proofing_report
       end
 
       csv
+    rescue Aws::CloudWatchLogs::Errors::MalformedQueryException => error
+      [
+        ['Error', 'Message'],
+        [error.class.name, error.message],
+      ]
     end
 
     def as_csv

spec/lib/reporting/monthly_proofing_report_spec.rb

@@ -58,6 +58,28 @@
     end
   end
 
+  describe '#proofing_report' do
+    context 'when the data is outside the log retention range' do
+      before do
+        allow(report.cloudwatch_client).to receive(:fetch).and_raise(
+          Aws::CloudWatchLogs::Errors::MalformedQueryException.new(
+            nil,
+            'exceeds the log groups log retention settings',
+          ),
+        )
+      end
+
+      it 'handles the error and returns a table with information on the error' do
+        expect(report.proofing_report).to match(
+          [
+            ['Error', 'Message'],
+            ['Aws::CloudWatchLogs::Errors::MalformedQueryException', kind_of(String)],
+          ],
+        )
+      end
+    end
+  end
+
   describe '#data' do
     it 'keeps unique users per event as a hash' do
       expect(report.data).to eq(