feat(designday): Add option to include location in DesignDay dict

The previous commit made the inclusion of Location objects in the DesignDay optional and this commit adds an argument to the `to_dict` method, allowing the user to choose whether to include it.

ladybug/designday.py

@@ -555,19 +555,30 @@ def to_idf(self):
 
  return ''.join(comented_str)
 
- def to_dict(self):
- """Convert the Design Day to a dictionary."""
- return {
+ def to_dict(self, include_location=True):
+ """Convert the Design Day to a dictionary.
+ 
+ Args:
+ include_location: If True, the location dictionary will be included in the
+ returned dictionary. This ensures that the sky condition contained
+ in any re-serialized design day can produce accurate radiation values.
+ However, this location is not necessary when exporting design days
+ for energy simulation since the EPW simulated with the model already
+ contains location information. Default: True.
+ """
+ des_day_dict = {
  'type': 'DesignDay',
  'name': self.name,
  'day_type': self.day_type,
- 'location': self.location.to_dict(),
  'dry_bulb_condition': self.dry_bulb_condition.to_dict(),
  'humidity_condition': self.humidity_condition.to_dict(),
  'wind_condition': self.wind_condition.to_dict(),
  'sky_condition': self.sky_condition.to_dict(),
  'type': 'DesignDay'
- }
+ }
+ if include_location:
+ des_day_dict['location'] = self.location.to_dict()
+ return des_day_dict
 
  def _get_daily_data_collections(self, data_type, unit, values):
  """Return an empty data collection."""