null principal in attribute resolver

[Daniele Russo]

Hi all, I have a strange problem with shibboleth IDP 2.3.5.
IDP is configured with UsernamePassword login handler, I use tigish library
to authenticate users on the DB.
All works, but occasionally IDP doesn't return attributes to SP and this
strange problem only occurs in production enviroment.
In debugging I noticed that the principal is enhanced in the authentication
phase, while in the attribute resolver phase is null.
This problem occurs with various operating systems and browsers.

Mozilla/5.0 (Windows; U; Windows NT 6.0; it; rv:1.9.2.23) Gecko/20110920
Firefox/3.6.23
Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1

Thanks

Daniele
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