title: Command grep failing in ansible when grep item not present
body: <p>Here the following piece of code is waiting  for the kubernetest pod to be disappeared  after launch.
  pod do disappeared but the script fails  with the error.
  I want to wait till pod disappeared and the continue with rest of the task.</p>
  
  <pre><code>- name: Check ms pod has disappeared
    sudo: yes
    run_once: true
    when: ansible_hostname !=  "inception-{{ vms_subdomain }}"
    shell: "kubectl get pod --namespace=vms | grep {{ item.key }}"
    register: command_res
    with_dict: "{{ microservices }}"
    until: "command_res.rc == 1"
    retries: 10
    delay: 20
  
  TASK [sp-sif : Check ms resouce has disappeared] *******************************
  Tuesday 07 February 2017  15:26:52 +0000 (0:00:02.051)       0:03:23.889 ******
  FAILED - RETRYING: TASK: sp-sif : Check ms resouce has disappeared (5 retries left).
  FAILED - RETRYING: TASK: sp-sif : Check ms resouce has disappeared (4 retries left).
  FAILED - RETRYING: TASK: sp-sif : Check ms resouce has disappeared (3 retries left).
  
  failed: [kubernetes-master-vik202vmsservices-1] (item={'key': u'iwan', 'value': {u'streams': u'ncs-alarms'}}) =&gt; {"attempts": 4, "changed": true, "cmd": "kubectl get pod --namespace=vms | grep iwanms", "del
  ta": "0:00:00.048855", "end": "2017-02-07 15:28:26.707882", "failed": true, "item": {"key": "iwan", "value": {"streams": "ncs-alarmsf"}}, "rc": 1, "start": "2017-02-07 15:28:26.659027", "stderr": "", "stdout
  ": "", "stdout_lines": [], "warnings": []}
  </code></pre>