title: contentDescription="@null" a bad idea?
body: <p>Lint complains hey set a contentDescription.  So to avoid creating a string I set it to null.</p>
  
  <pre><code>android:contentDescription="@null"
  </code></pre>
  
  <p>This seems to quiet down the complaints from lint.  I'm a bit lost why I need to set a string reference to the contentDescription.  What is the purpose of this? Why would I ever need this? and essentially setting it to null, is it a good idea?</p>