Corrected a core data migration crash if the username is empty and also prevent a crash if the password is removed from the keychain
Bumped version to 3.7.1 to support hotfix
Fixing incorrect user id sent to Quantcast.
One additional crash fix for when primary blog ID isn't set and NSNumber compareWithNumber fails passing it nil
Merge remote-tracking branch 'origin/hotfix-3.7.1'