I have a datetime field that is store in the database looking like this: 2016-06-30 00:00:00.000

I am being asked to convert that format to dd/mm/yyyy

I can do this with 
 `Convert(varchar,PRICE_TAB.F137,103) as 'SalesPriceStartDateGood',`

This column contains NULLS though, and where it contains NULLS I want to return nothing. This is being exported to CSV so I want it to come across as ,, for that spot in the file. 

How do I write the query to say convert to this format, unless null, then give me nothing?