Description of problem:
Running an install using command:
ipa-server-install --setup-dns --forwarder=10.14.63.12 --hostname=qe-blade-01.testrelm -r TESTRELM -n testrelm -p <xxx> -P <xxx> -a <xxx> -U



throws error:
Configuring Kerberos KDC: Estimated time 30 seconds
  [1/14]: setting KDC account password
  [2/14]: adding sasl mappings to the directory
  [3/14]: adding kerberos entries to the DS
  [4/14]: adding default ACIs
  [5/14]: configuring KDC
Unexpected error - see ipaserver-install.log for details:
 'NoneType' object has no attribute 'find'



ipaserver-install.log has:
2011-10-14 08:18:54,618 DEBUG   [5/14]: configuring KDC
2011-10-14 08:18:54,619 DEBUG Backing up system configuration file '/var/kerberos/krb5kdc/kdc.conf'
2011-10-14 08:18:54,619 DEBUG Saving Index File to '/var/lib/ipa/sysrestore/sysrestore.index'
2011-10-14 08:18:54,620 DEBUG Backing up system configuration file '/etc/krb5.conf'
2011-10-14 08:18:54,620 DEBUG Saving Index File to '/var/lib/ipa/sysrestore/sysrestore.index'
2011-10-14 08:18:54,628 DEBUG Backing up system configuration file '/usr/share/ipa/html/krb5.ini'
2011-10-14 08:18:54,629 DEBUG   -> Not backing up - '/usr/share/ipa/html/krb5.ini' doesn't exist
2011-10-14 08:18:54,629 DEBUG Backing up system configuration file '/usr/share/ipa/html/krb.con'
2011-10-14 08:18:54,629 DEBUG   -> Not backing up - '/usr/share/ipa/html/krb.con' doesn't exist
2011-10-14 08:18:54,629 DEBUG Backing up system configuration file '/usr/share/ipa/html/krbrealm.con'
2011-10-14 08:18:54,629 DEBUG   -> Not backing up - '/usr/share/ipa/html/krbrealm.con' doesn't exist
2011-10-14 08:18:55,152 DEBUG args=kdb5_ldap_util -D uid=kdc,cn=sysaccounts,cn=etc,dc=testrelm create -s -r TESTRELM -subtrees dc=testrelm -sscope sub
2011-10-14 08:18:55,152 DEBUG stdout=Password for "uid=kdc,cn=sysaccounts,cn=etc,dc=testrelm": 
Initializing database for realm 'TESTRELM'
You will be prompted for the database Master Password.
It is important that you NOT FORGET this password.
Enter KDC database master key: 
Re-enter KDC database master key to verify: 

2011-10-14 08:18:55,152 DEBUG stderr=
2011-10-14 08:18:55,162 DEBUG args=klist -V
2011-10-14 08:18:55,162 DEBUG stdout=Kerberos 5 version 1.9

2011-10-14 08:18:55,162 DEBUG stderr=
2011-10-14 08:18:55,163 DEBUG Backing up system configuration file '/etc/sysconfig/krb5kdc'
2011-10-14 08:18:55,163 DEBUG Saving Index File to '/var/lib/ipa/sysrestore/sysrestore.index'
2011-10-14 08:18:55,171 DEBUG 'NoneType' object has no attribute 'find'
  File "/usr/sbin/ipa-server-install", line 1151, in <module>
    sys.exit(main())

  File "/usr/sbin/ipa-server-install", line 1036, in main
    subject_base=options.subject)

  File "/usr/lib/python2.6/site-packages/ipaserver/install/krbinstance.py", line 180, in create_instance
    self.start_creation("Configuring Kerberos KDC", 30)

  File "/usr/lib/python2.6/site-packages/ipaserver/install/service.py", line 248, in start_creation
    method()

  File "/usr/lib/python2.6/site-packages/ipaserver/install/krbinstance.py", line 371, in __create_instance
    appendvars=appendvars)

  File "/usr/lib/python2.6/site-packages/ipapython/ipautil.py", line 1281, in backup_config_and_replace_variables
    old_values = config_replace_variables(filepath, replacevars, appendvars)

  File "/usr/lib/python2.6/site-packages/ipapython/ipautil.py", line 1238, in config_replace_variables
    if value.find(appendvars[option]) == -1:



Version-Release number of selected component (if applicable):
ipa-server-2.1.2-100.20111014T0057zgit16fc9f8.el6.x86_64

How reproducible:
always

Steps to Reproduce:
1. ipa-server-install --setup-dns --forwarder=10.14.63.12 --hostname=qe-blade-01.testrelm -r TESTRELM -n testrelm -p <xxx> -P <xxx> -a <xxx> -U


Actual results:
throws error:
 'NoneType' object has no attribute 'find'

Expected results:
successful install

Additional info: