Description of problem:

This appears to be a regression in the happy path behavior of rhn-migrate-classic-to-rhsm.  After a normal rhnreg_ks registration, a simple migration fails as follows....

[root@rhsm-compat-rhel59 ~]# rhn-migrate-classic-to-rhsm -n
Red Hat account: qa
Password:
System Engine Username: testuser1
Password:
Org: admin
 
Retrieving existing RHN Classic subscription information...
 
+-----------------------------------------------------+
System is currently subscribed to these RHN Classic Channels:
+-----------------------------------------------------+
rhel-x86_64-server-5
 
+-----------------------------------------------------+
Installing product certificates for these RHN Classic channels:
+-----------------------------------------------------+
rhel-x86_64-server-5
 
Product certificates installed successfully to /tmp/migratedProductCertDir.
coercing to Unicode: need string or buffer, NoneType found
[root@rhsm-compat-rhel59 ~]# echo $?
255


Did NOT expect "coercing to Unicode: need string or buffer, NoneType found"


Here's the stacktrace found in rhsm.log...
2013-05-23 07:10:36,443 [ERROR]  @managercli.py:150 - Exception caught in rhm-migrate-classic-to-rhsm
2013-05-23 07:10:36,443 [ERROR]  @managercli.py:151 - coercing to Unicode: need string or buffer, NoneType found
Traceback (most recent call last):
  File "/usr/sbin/rhn-migrate-classic-to-rhsm", line 74, in ?
    sys.exit(abs(main() or 0))
  File "/usr/sbin/rhn-migrate-classic-to-rhsm", line 65, in main
    return migrate.MigrationEngine().main()
  File "/usr/share/rhsm/subscription_manager/migrate/migrate.py", line 677, in main
    self.write_migration_facts()
  File "/usr/share/rhsm/subscription_manager/migrate/migrate.py", line 485, in write_migration_facts
    json.dump({"migration.classic_system_id": self.get_system_id(),
  File "/usr/share/rhsm/subscription_manager/migrate/migrate.py", line 476, in get_system_id
    p = libxml2.parseDoc(file(system_id_path).read())
TypeError: coercing to Unicode: need string or buffer, NoneType found


Version-Release number of selected component (if applicable):
[root@rhsm-compat-rhel59 ~]# rpm -q subscription-manager python-rhsm
subscription-manager-1.8.8-1.git.8.7625592.el5
python-rhsm-1.8.11-1.git.1.7236cc2.el5