Fix include_vars playbook when everything is skipped

This loop_control.label fails on ansible 2.7.9 when everything is skipped in the
playbook:

TASK [Include vars files] *********************************************************************************************************************************************************************
Monday 09 December 2019  03:40:35 -0500 (0:00:00.044)       0:00:04.049 *******
fatal: [localhost]: FAILED! => {"msg": "'dict object' has no attribute 'stat'"}
        to retry, use: --limit @/tmp/agnosticd/ansible/destroy.retry

This commit if applied fix that error.