Fix a bug if you have no roles at all
This could not happen currently, but might happen later on if a group
is defined that does not have an 'anybody' membership.
Patch by: Sverre Rabbelier
"""
Code used in a couple of places to work with the current thread's environment.
Current users include i18n and request prefix handling.
"""
try:
import threading
currentThread = threading.currentThread
except ImportError:
def currentThread():
return "no threading"