BibDocFile: handling of exceptions in Md5Folder
- Improves handling of exceptions in Md5Folder by not causing automatic reload of md5 in case of Exceptions. (closes #1060)
- Additionally, always use register_exception(alert_admin=True) in case of MD5 related issues, as these are severe enough to call for further human check.
- Introduces Md5Folder regression tests.
Reported-by: Alessio Deiana <alessio.deiana@cern.ch>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>