code: def dict_to_row(cls, observation_data):
          
          row = []
          row.append(observation_data['name'])
          row.append(observation_data['date'])
          row.append(observation_data['magnitude'])
          comment_code = observation_data.get('comment_code', 'na')
          if not comment_code:
              comment_code = 'na'
          row.append(comment_code)
          comp1 = observation_data.get('comp1', 'na')
          if not comp1:
              comp1 = 'na'
          row.append(comp1)
          comp2 = observation_data.get('comp2', 'na')
          if not comp2:
              comp2 = 'na'
          row.append(comp2)
          chart = observation_data.get('chart', 'na')
          if not chart:
              chart = 'na'
          row.append(chart)
          notes = observation_data.get('notes', 'na')
          if not notes:
              notes = 'na'
          row.append(notes)
          return row
docs: Takes a dictionary of observation data and converts it to a list
          of fields according to AAVSO visual format specification.
  
          :param cls: current class
          :param observation_data: a single observation as a dictionary