I found a solution that is not what I was looking for but it works just as well.
I inserted a note above the begin group row with a label of "Number of unanswered question in <group name>
In the calculations field I used and "if" statement
(if(${ACNORMALEMERGENCY} =‘‘,1,0)) + (if(${ACSOURCEDISCONNECT} =‘‘,1,0)) + (if(${ACSOURCEDISCONNECTACCESS} =‘‘,1,0)) + (if(${ACSOURCEDISCONNECTTYPE} =‘‘,1,0)) + (if(${ACSOURCEDISCONNECTCONDIT} =‘‘,1,0)) + (if(${ACTRANSFERSWITCH} =‘‘,1,0))
Which resulted in a Sum of the number of questions that are <null>
I then pasted the calculation into the relevant column so when the number of unanswered questions was zero it would turn the note off
(if(${ACNORMALEMERGENCY} =‘‘,1,0)) + (if(${ACSOURCEDISCONNECT} =‘‘,1,0)) + (if(${ACSOURCEDISCONNECTACCESS} =‘‘,1,0)) + (if(${ACSOURCEDISCONNECTTYPE} =‘‘,1,0)) + (if(${ACSOURCEDISCONNECTCONDIT} =‘‘,1,0)) + (if(${ACTRANSFERSWITCH} =‘‘,1,0)) > 0