BUG-14980 Validacion Date en Pmtables no es respetada SOLVED

- The om propel class generates a validation for null values if for the fields date/time.
- A validation was added in the om propel class for null values if in the pmtable it's defined.
Merge pull request #2429 from marcoAntonioNina/BUG-14980

BUG-14980 Validacion Date en Pmtables no es respetada SOLVED