title: Check If excel cell is empty
body: <p>I need vba code for excel. I'm checking whether A1, B7, C9 are empty onclick.</p>
  
  <p>If they are empty (any or all of the variables is/are empty), I need to return:<br>
  " is so so so cell is empty click ok to fill it"</p>
  
  <p>If none of the cells is empty, or if all of them are not empty, or they contain any value, I need to return:<br>
  "Do my stuff"</p>
  
  <p>There is a link to a particular workbook, but I wanted to check here also.</p>