<p>output empty performance data value as value "U" to "indicate that the actual value couldn't be determined" (defined in <a href="https://nagios-plugins.org/doc/guidelines.html#AEN200">https://nagios-plugins.org/doc/guidelines.html#AEN200</a>) and do valid output</p>

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<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5'>https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>output empty values as "U"</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5/files#diff-0">lib/Monitoring/Plugin/Performance.pm</a>
    (9)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5.patch'>https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5.patch</a></li>
  <li><a href='https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5.diff'>https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5.diff</a></li>
</ul>

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