I just got it solved
What did I do to solve the solution:
- Place the FormIT-Snippet-Call ABOVE the IF-snippet-call with the formit-placeholder
- Use [[!if?subject=`[[+fi.field]]&operator=`empty`&then=``&else=``]] INSTEAD OF [[+fi.field:is=``:then=``:else=``]], cause the last one doesn’t seem to work! (I dont know why)
Really strange but those 2 things solved my problem.
Thanks for everybody who helped me come to the solution!