'Virtual field for event_event - returns the year of this entry
used for report.
Requires "start_date" to be in extra_fields
@param row: the Row
@ToDo: Extend this to show multiple years if open for multiple?'

@staticmethod
def event_event_year(row):

    try:
        thisdate = row['event_event.start_date']
    except AttributeError:
        return current.messages['NONE']
    if (not thisdate):
        return current.messages['NONE']
    return thisdate.year
