<p>stop adding plus signs when serializing empty strings</p>
<p>github issue <a class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="495371747" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/2067" data-hovercard-type="issue" data-hovercard-url="/kamailio/kamailio/issues/2067/hovercard" href="https://github.com/kamailio/kamailio/issues/2067">#2067</a></p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/kamailio/kamailio/pull/2068'>https://github.com/kamailio/kamailio/pull/2068</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>core: fix xavp_serialize_fields</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/2068/files#diff-0">src/core/xavp.c</a>
    (7)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/kamailio/kamailio/pull/2068.patch'>https://github.com/kamailio/kamailio/pull/2068.patch</a></li>
  <li><a href='https://github.com/kamailio/kamailio/pull/2068.diff'>https://github.com/kamailio/kamailio/pull/2068.diff</a></li>
</ul>

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