def parse_predecessor_ids(predecessor_ids_string):
	"""Parses a comma seperated list of task IDs
		Args: 
			predecessor_ids_string: [string] comma separated task IDs
		Returns:
			List of task IDs as integers
	"""
	predecessor_ids = []
	predecessor_ids_strings = predecessor_ids_string.split(',')
	for predecessor_id_string in predecessor_ids_strings:
		if predecessor_id_string != '':
			predecessor_ids.append(int(predecessor_id_string))
	return predecessor_ids