Unable to fetch email template

[Samyak613]

I am facing an issue with email template, I am able to open the email outlook draft but the email template content is not fetched and returns null. I have set it up as when a user clicks on a button it triggers a function which calls the correct email template based on a field's content which is Illegal Activations or Double Activations. 

Can someone please help? 

Widget Editor's Function for triggering script include : 

c.sendEmail = function() {

    var ga = new GlideAjax('GetEmailTemplate');

    ga.addParam('sysparm_name', 'getEmailBody');

    ga.addParam('sysparm_subject', c.subject);

    ga.addParam('sysparm_greetingName', c.greetingName);

    ga.getXMLAnswer(function(response) {

console.log('Server response:', response);

        var templateContent = response;

        var encodedTo = encodeURIComponent(c.to);

        var encodedCc = encodeURIComponent(c.cc);

        var encodedSubject = encodeURIComponent(c.subject);

        var encodedBody = encodeURIComponent(templateContent);

        var mailToLink = "mailto:" + encodedTo + "?cc=" + encodedCc + "&subject=" + encodedSubject + "&body=" + encodedBody;

        window.location.href = mailToLink;

    });

Script Include : 

var GetEmailTemplate = Class.create();

GetEmailTemplate.prototype = {

    initialize: function() {},

    getEmailBody: function() {

        var subject = this.getParameter('sysparm_subject');

        var greetingName = this.getParameter('sysparm_greetingName');

        var version = this.getParameter('sysparm_version') || 'none';

        var templateName = (subject === "Illegal Activations") ?

            "Illegal Activations Email Template" : "Double Activations Email Template";

        var template = new GlideRecord('sysevent_email_template');

        template.get('name', templateName);

        var body = template.getValue('body');

        body = body.replace('${greeting_name}', greetingName);

        return body;

    },

    type: 'GetEmailTemplate'

};