title: Unwrap String and check emptiness in the same if statement
body: <p>I want to achieve this</p>
  
  <pre><code>if let large = imageLinks.large {
  
      if !large.isEmpty {
  
          result = large
      }
  }
  </code></pre>
  
  <p>in a single if statement, something like this (this does not compiles)</p>
  
  <pre><code>if let large = imageLinks.large where !large.isEmpty {
  
      result = large       
  }
  </code></pre>
  
  <p>Is it possible? </p>