Traceback (most recent call last):
  File "/home/deafmints/muddev/evennia/evennia/commands/cmdhandler.py", line 591, in _run_command
    ret = cmd.func()
  File "/home/deafmints/muddev/evennia/evennia/commands/default/general.py", line 74, in func
    self.msg(caller.at_look(target))
  File "/home/deafmints/muddev/evennia/evennia/objects/objects.py", line 1497, in at_look
    description = target.return_appearance(self)
  File "/home/deafmints/muddev/mygame/typeclasses/wiseobject.py", line 25, in return_appearance
    wisewords = wisewords % choice(self.db.wise_texts)
  File "/usr/lib/python2.7/random.py", line 277, in choice
    return seq[int(self.random() * len(seq))]  # raises IndexError if seq is empty
TypeError: object of type 'NoneType' has no len()

from random import choice
from typeclasses.objects import Object

class WiseObject(Object):
	"""
	An object speaking when someone looks at it. We assume
	it looks like a stone in this example
	"""
	def at_object_creation(self):
		"Called when object is first created"
		self.db.wise_texts = \
			["Stones have feelings too.",
			"To live like a stone is to not have lived at all",
			"The world is like a rock of chocolate."]

	def return_appearance(self, looker):
		"""
		Called by the look command. We want to return
		a wisdom when we get looked at.
		"""
		# first get the base string from the
		# parent's return_appearance.
		string = super(WiseObject, self).return_appearance(looker)
		wisewords = "\n\nIt grumbles and says: '%s'"
		wisewords = wisewords % choice(self.db.wise_texts)
		return string + wisewords