Fix wrong redirect when changing partial path or link name. Remove an unnecessary assignment in logic/models/base.py that would generate an error when an entity did not exist. Patch by: Lennard de Rijk Review by: Pawel Solyga

# Directions for web crawlers.
# See http://www.robotstxt.org/wc/norobots.html.

User-agent: HTTrack
User-agent: puf
User-agent: MSIECrawler
User-agent: Nutch
Disallow: /