BUG 15071 Problemas en la extension de un output con la opcion "By clicking on the generated file link=Download the file" SOLVED

- Missing validation in the dropdown class
- Added validation in the dropdown class to add missing option only when the field is render in view mode
Merge pull request #2432 from julceslauhub/master

BUG 15071 Problemas en la extension de un output con la opcion "By clicking on the generated file link=Download the file" SOLVED