title: Using Conditional Formatting to highlight a cell based on an adjacent cell, but only if the cell being formatted is blank
body: <p>I am trying to create a conditional format that will highlight a cell if it is empty and an adjacent cell has the word "Closed" in it. I basically want to use the highlight as an alert for the user that if the cell contains "Closed" they need to put the closed date into the highlighted cell. In the picture below, the "Status" column is what I want to base my format on and the right most column is the cell I want to highlight, until the date is put in.</p>
  
  <p><img src="https://i.stack.imgur.com/gEMd1.png" alt="image"></p>
  
  <p>Thank you!</p>