check Field is empty

hello devs i have to check if field is empty i use xml transformation and my macro like but its not working i just want check if exist any help thanks: {% if(JobLink != null) { %} @span class=@news@@@a class=@news@ target=@_blank@ href=@{%JobLink%}@@view this job @/a@@i class=@fa fa-angle-right@@@/i@@/span@ {% } #%}