Here is the "Easy Solution" for that. We "don't need to go for Calculated Fields".
1) Just Drag that Date values in the View.
2) Change the Date Format what ever you want.
3) Convert that Date Dimension field in to the string .
4) And Right Click on the Null Value where it is present in the view.
5) Click on Edit Alias => give the particular Name or, Give Empty Space what ever you Want.
6) Then Again Convert that date dimension in to the Date format.
You will get the Desired Output.