Description of problem:

After updating from 0.244 to 0.254 pulp-migrate gives a validation error:

# pulp-migrate 
data model in use matches the current version
4 errors on validation, see /var/log/pulp/db.log for details


# tail /var/log/pulp/db.log 
model validation failure in Repo for model centos6-x86_64: field notes is <type 'NoneType'> not <type 'dict'>
model validation failure in Repo for model fedora-15-x86_64: field notes is <type 'NoneType'> not <type 'dict'>
model validation failure in Repo for model rhel6-pulp-x86_64: field notes is <type 'NoneType'> not <type 'dict'>
model validation failure in Repo for model epel-6-x86_64: field notes is <type 'NoneType'> not <type 'dict'>

Version-Release number of selected component (if applicable):

# rpm -qa | grep pulp
python-isodate-0.4.4-3.pulp.fc15.noarch
pulp-common-0.0.254-1.fc15.noarch
pulp-0.0.254-1.fc15.noarch
pulp-selinux-server-0.0.254-1.fc15.noarch
pulp-admin-0.0.254-1.fc15.noarch
mod_wsgi-3.2-6.pulp.fc15.i686
python-oauth2-1.5.170-2.pulp.fc15.noarch
m2crypto-0.21.1.pulp-5.fc15.i686
pulp-client-lib-0.0.254-1.fc15.noarch


How reproducible:

Always.

Steps to Reproduce:
1. Run pulp-migrate
2. Get error
  
Actual results:

Migration mentiones validation errors

Expected results:

Migration should work.

Additional info:

pulp.log shows the following *after* the migration:

2011-12-07 13:50:52,396 3990:-1217071280: pulp.server.db.connection:INFO: connection:46 Attempting Database connection with seeds = localhost
2011-12-07 13:50:52,397 3990:-1217071280: pulp.server.db.connection:INFO: connection:51 Database connection established with: seeds = localhost, name = pulp_database
2011-12-07 13:50:52,736 3990:-1217071280: pulp:CRITICAL: version:158 data model version is up to date, but has not been validated
2011-12-07 13:50:52,736 3990:-1217071280: pulp:CRITICAL: version:159 use the 'pulp-migrate' tool to fix this before restarting the web server