<p>Easiest would be to raise some error message, if the tag content is empty:</p>
<p>trace.rb/update_from_xml_node</p>
<div class="highlight highlight-source-ruby"><pre>    <span class="pl-c1">self</span>.tags <span class="pl-k">=</span> pt.find(<span class="pl-s"><span class="pl-pds">"</span>tag<span class="pl-pds">"</span></span>).collect <span class="pl-k">do</span> |<span class="pl-smi">tag</span>|
      <span class="pl-k">raise</span> <span class="pl-c1">OSM</span>::<span class="pl-c1">APIBadXMLError</span>.<span class="pl-k">new</span>(<span class="pl-s"><span class="pl-pds">"</span>trace<span class="pl-pds">"</span></span>, pt, <span class="pl-s"><span class="pl-pds">"</span>Tag value may not be empty<span class="pl-pds">"</span></span>) <span class="pl-k">if</span> tag.content.empty?
      <span class="pl-c1">Tracetag</span>.<span class="pl-k">new</span>(<span class="pl-c1">:tag</span> => tag.content) 
    <span class="pl-k">end</span></pre></div>

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