add log for virus_scanner (#3859)

Remonte les informations en cas d'erreur lors de l'exécution de l'antivirus

app/lib/active_storage/virus_scanner.rb

@@ -35,6 +35,7 @@ class ActiveStorage::VirusScanner
   end
 
   def metadata
+    begin
       download_blob_to_tempfile do |file|
         if ClamavService.safe_file?(file.path)
           { virus_scan_result: SAFE, scanned_at: Time.zone.now }
@@ -42,5 +43,8 @@ class ActiveStorage::VirusScanner
           { virus_scan_result: INFECTED, scanned_at: Time.zone.now }
         end
       end
+    rescue StandardError => e
+      Raven.capture_exception(e)
+    end
   end
 end