<p>Closes <a href="https://github.com/opentechinstitute/commotion-dashboard-helper/issues/18" class="issue-link" title="cron job added even if already present">#18</a> </p>

<p>To test:<br>
0. Begin with a configured 1.0/1.1 node. Log in via ssh and make sure the commotion-dashboard-helper entry appears only once in crontab (<code>crontab -l</code>). Delete any duplicates.<br>
1. Run sysupgrade using this branch.<br>
2. Check crontab again. There should not be a duplicate entry for commotion-dashboard-helper.</p>

<hr>

<h4>You can merge this Pull Request by running</h4>
<pre>  git pull https://github.com/opentechinstitute/commotion-dashboard-helper crontab</pre>
<p>Or view, comment on, or merge it at:</p>
<p>  <a href='https://github.com/opentechinstitute/commotion-dashboard-helper/pull/19'>https://github.com/opentechinstitute/commotion-dashboard-helper/pull/19</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Check for existing entry before adding to crontab</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/opentechinstitute/commotion-dashboard-helper/pull/19/files#diff-0">files/uci-defaults/commotion-dashboard-helper</a>
    (4)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/opentechinstitute/commotion-dashboard-helper/pull/19.patch'>https://github.com/opentechinstitute/commotion-dashboard-helper/pull/19.patch</a></li>
  <li><a href='https://github.com/opentechinstitute/commotion-dashboard-helper/pull/19.diff'>https://github.com/opentechinstitute/commotion-dashboard-helper/pull/19.diff</a></li>
</ul>

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