check that the value returned is an url. This effectively close bug #13, but really is a hack where the value should be tested to belong to a given thesaurus.
#!/usr/bin/env python
import os
import sys
if __name__ == "__main__":
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "p4l.settings")
from django.core.management import execute_from_command_line
execute_from_command_line(sys.argv)