Filter to always have OR 'field' IS NULL

[Mike_Nestor]

Is there a simple way, without going into creating separate parameters and sql_always_where to set a field to always have include the null values too?

Joining 2 tables, filter some value from table1 but the join produced nulls in that column but I still want the unmatched items from table2. So I would have to add the filter field and have it include null for everything. 

Rather not try to train the users to do that but don’t to throw down a lot of code if possible.