Magento 2: System.xml configuration shows blank

Kindly set your email_templates.xml file under etc folder with below contents,

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Email:etc/email_templates.xsd">
    <template id="cust_general_your_email_template_field_id" label="Label Of Your Template File" file="your_email_template.html" type="html" module="Amitshree_Customer" area="adminhtml"/>
</config>

You need to pass your template with id equals to cust_general_your_email_template_field_id

Remove var/generation folder or generated folder from root.