Get value of custom radio select option

Get value of custom radio select option

We have multiple types of install requests that come in and I want to make sure that the naming is consistent for all fields. 

I have a custom script setup the change the subject to a specific format:

var clientname = await CS.getValue("udf_char2");
var ver = await CS.getValue("udf_char4");
var apptype = await CS.getValue("udf_char11");
var sub = "Application Install Request - Normal Business Hours -" + " " + clientname + " - " + ver + " - " + apptype;
CS.setValue("subject",sub);
CS.end();

Problem I am having is "App Type" is extremely important to get added to the subject line but I am unable to do so as it is setup as a radio button selections. See attached. 

It will return a null value with an option selected:
" Application Install Request - Normal Business Hours - Client - 1.0 - null "

Is there anyway to grab the selection of a radio button selection or use another format to grab a predefined list of options that I can use as a variable to add to my ticket names?

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