How to use conditionals to check for NULL in Xthreads?

[ollie2015]

yes I have set the blank value, and I am using that blank value elsewhere....

BUT i need to check if the initial field is empty or not

eg. User Avatar, if not filled, then use default, BUT in another location, i need to check for the user Avatar, if present then display it and if NOT to display NOTHING, no default avatar either