I only want to display a field in a view, if that field has been completed. For example, I have a form that has an optional field: 'previous name'  field ID=121 But if an entry doesn't have a previous name or have this field completed, I don't want it to display in the view.  

Using the below, I can get the veiw to display "Previous Name" but not the submitted field value for 121.

[if 121 not_equal=""]Previous Name:[/if 121]

what am I doing wrong?

Thanks!