title: kubectl patch deplyoment results in 'The "" is invalid'
body: <p>I try to patch a deployment with the following command:</p>
  
  <pre><code>kubectl patch deployment spin-clouddriver -n spinnaker --type='json' -p='[{"op": "add", "path": "/spec/spec/containers/0/volumeMounts", "value": {"mountPath": "/etc/ssl/certs/java/cacerts", "subPath": "cacerts", "name": "cacerts"}}]'
  </code></pre>
  
  <p>which results in</p>
  
  <pre><code>The  "" is invalid
  </code></pre>
  
  <p>I don't see where is the error nor do I see how the message helps me to find the problem. Any hints?</p>