title: Azure Logic App - simple condition to check for empty string variable fails
body: <h1>Solved</h1>
  <p><strong>Issue was due to error in child action as Thomas pointed out, not the way I was checking the variable value.</strong></p>
  <hr />
  <p>I've got a variable that's been initialized earlier in the LA. Later on I'm trying to check if the variable is empty using a condition.</p>
  <p><a href="https://i.stack.imgur.com/QKtNv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QKtNv.png" alt="enter image description here" /></a></p>
  <p>Here's the output from the run history:</p>
  <p><a href="https://i.stack.imgur.com/dHk0R.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dHk0R.png" alt="enter image description here" /></a></p>
  <p><a href="https://i.stack.imgur.com/jYVxk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/jYVxk.png" alt="enter image description here" /></a></p>
  <p>It looks like the variable is an empty string at this point, however the condition fails without any helpful information.</p>
  <p><a href="https://i.stack.imgur.com/YzNzh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YzNzh.png" alt="enter image description here" /></a></p>
  <p>I've also tried null or wrapping the variable in the empty command and comparing to true/false. All gave the same failure.</p>