<p>When reversing a route with full or partial empty <code>to</code> and <code>from</code> inputs, we get an exception.</p>
<p>Steps to reproduce.</p>
<ul>
<li>open directions,</li>
<li>enter something in <code>to</code> input.</li>
<li>hit reverse directions</li>
<li>the variable <code>to</code> is undefined, but the properties <code>lat</code> and <code>lng</code> are accessed.</li>
</ul>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/2410353/73133630-d7695f80-402b-11ea-957c-82e76b2a375a.png"><img src="https://user-images.githubusercontent.com/2410353/73133630-d7695f80-402b-11ea-957c-82e76b2a375a.png" alt="image" style="max-width:100%;"></a></p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/2521'>https://github.com/openstreetmap/openstreetmap-website/pull/2521</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Prevent exceptions while reversing directions</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2521/files#diff-0">app/assets/javascripts/index/directions.js</a>
    (12)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2521.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/2521.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2521.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/2521.diff</a></li>
</ul>

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