Removed fallback access to logged user data
Removed fallback access to logged user data

In TIP_User::getField(), on null value there was a fallback
access to the current logged user row. This prevented the
aknowledge of null values on any user row.

Now the view of the logged user row is not ended (as it was
before!) and getField() is not overriden.

BackupTheBerlios/tip