Don't show a field when a more important field is shown in a View Drupal 7
Use the Views Conditional module. It does exactly what you want to achieve.


  How to use Views Conditional in your Views:
  
  
  Create a view. Add some fields under "FIELDS".
  Click on "ADD" next to fields. Scroll down to "Views: Views
  Conditional", probably found near the bottom of the list.
  Add and configure fields...
  Choose a field to run a condition against, and provide values
  accordingly.
  Save, views conditional handles the logic and returns as specified.