salt percona repo problem in Wheezy

.sls excerpt:

{% if grains['os'] == 'Ubuntu' %}
{% set repo_name = 'deb http://repo.percona.com/apt precise main' %}
{% elif grains['os'] == 'Debian' %}
{% set repo_name = 'deb http://repo.percona.com/apt wheezy main'%}
{% endif %}

percona-pkrepo:
  pkgrepo.managed:
    - name: {{repo_name}}
    - disabled: False
    - keyid: CD2EFD2A
    - keyserver: keys.gnupg.net
    - require_in:
      - percona-server
      - percona-client
~

Results of Precise run:
    State: - pkgrepo
    Name:      deb http://repo.percona.com/apt precise main
    Function:  managed
        Result:    True
        Comment:   Configured package repo deb http://repo.percona.com/apt precise main
        Changes:   repo: deb http://repo.percona.com/apt precise main

Results of Wheezy run:
    State: - pkgrepo
    Name:      deb http://repo.percona.com/apt wheezy main
    Function:  managed
        Result:    False
        Comment:   An exception occurred in this state: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/salt/state.py", line 1237, in call
    *cdata['args'], **cdata['kwargs'])
  File "/usr/lib/python2.7/dist-packages/salt/states/pkgrepo.py", line 200, in managed
    sanitizedkwargs = __salt__['pkg.expand_repo_def'](repokwargs)
  File "/usr/lib/python2.7/dist-packages/salt/modules/apt.py", line 1196, in expand_repo_def
    raise Exception(msg)
Exception: Error: aptsources.sourceslist python module not found