If you have text that you want to appear only if a variable resolves to a non-null value, you should place them together between square brackets.
Example Template:
[This line is generated if "Exist" is not null: %Exist%] This line is generated even if "Exist" is null: %Exist%
Output (if Exist is null):
This line is generated even if "Exist" is null:
Output (if Exist is not null):
This line is generated if "Exist" is not null: Y This line is generated even if "Exist" is null: Y
For more information see Conditional blocks.