title: Git + gerrit: forcing new patch set without any changes
body: <p><strong>TL;DR</strong></p>
  
  <p>I want to <code>git review -R</code> even though I changed nothing since I did it the last time. I get an error <code>No changes between prior commit 5aa6a81 and new commit 2f0fa24</code>. How to force it?</p>
  
  <p><strong>Whole story</strong></p>
  
  <p>What I want may seem weird, but I have a reason for it: each new patch set triggers integration tests on Jenkins, which may fail because some service is unavailable and mark my change with <code>Verified -1</code>. After such failure, I want to retrigger the tests.</p>
  
  <p>I used to look for a file without newline at the end and add it, but I hope there is a better way.</p>