title: DynamoDB - Return which ConditionExpression was false
body: <p>I am calling PutItem with a <code>ConditionExpression</code> that looks like:</p>
  
  <p><code>attribute_exists(id) AND object_version = :x</code></p>
  
  <p>In other words, I only want to update an item if the following conditions are true:</p>
  
  <ol>
  <li>The object needs to exists</li>
  <li>My update must be on latest version of the object</li>
  </ol>
  
  <p>Right now, if the check fails, I don't know which condition was false. Is there a way to get information on which conditions were false? Probably not but who knows...</p>