title: Conditional Formatting based on two different cell values
body: <p>I want to color a specific cell if (for example):</p>
  
  <ul>
  <li>A1 has a value (meaning it is not blank)</li>
  <li>B1 has no value (meaning it is blank)</li>
  </ul>
  
  <p>In this scenario I would like to color B1 red.
  I want the formula to apply to the entirety of the B-column.</p>