Conf-select calls should tolerate failure on existing directory

Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/after-INSTALL/scripts/hook.py", line 38, in <module>
    AfterInstallHook().execute()
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 218, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/after-INSTALL/scripts/hook.py", line 35, in hook
    link_configs(self.stroutfile)
  File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/after-INSTALL/scripts/shared_initialization.py", line 91, in link_configs
    _link_configs(k, json_version, v)
  File "/var/lib/ambari-agent/cache/stacks/HDP/2.0.6/hooks/after-INSTALL/scripts/shared_initialization.py", line 156, in _link_configs
    conf_select.select("HDP", package, version)
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/functions/conf_select.py", line 241, in select
    shell.checked_call(get_cmd("set-conf-dir", package, version), logoutput=False, quiet=False, sudo=True)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 70, in inner
    result = function(command, **kwargs)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 92, in checked_call
    tries=tries, try_sleep=try_sleep)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 140, in _call_wrapper
    result = _call(command, **kwargs_copy)
  File "/usr/lib/python2.6/site-packages/resource_management/core/shell.py", line 291, in _call
    raise Fail(err_msg)
resource_management.core.exceptions.Fail: Execution of 'conf-select set-conf-dir --package pig --stack-version 2.3.0.0-2557 --conf-version 0' returned 1. pig not installed or incorrect package name