employee_details.xml file in reports

<?xml version="1.0" encoding="utf-8"?>
<odoo>
<template id="report_employees">
<t t-call="web.html_container">
<t t-foreach="docs" t-as="employee">
<t t-call="web.external_layout">
<div class="page">
<div class="oe_structure">
<h2>Employee Details</h2>
<p>Name: <t t-esc="employee.name"/></p>
<p>Email: <t t-esc="employee.email"/></p>
</div>
</div>
</t>
</t>
</t>
</template>
</odoo>

Action within the report area is

<record id="action_report_product_templates" model="ir.actions.report">
<field name="name">Employee Details</field>
<field name="model">employee.details.report.wizard</field>
<field name="report_type">qweb-pdf</field>
<field name="report_name">gb_custom_hr.report_employees</field>
<field name="report_file">gb_custom_hr.report_employees</field>
<field name="print_report_name">'Employee Report - %s' % (object.name)</field>
<field name="binding_model_id" ref="model_employee_details_report_wizard"/>
<field name="binding_type">report</field>
</record>

model in wizard

from odoo import fields, models, api

class EmployeeReportWizard(models.TransientModel):
_name = "employee.details.report.wizard"
_description = "Search Employee Details Wizard"

name = fields.Many2one('hr.employee', string="Name")
date_from = fields.Date(string="Date From")
date_to = fields.Date(string="Date To")

def action_print_report(self):
data = {
#'form': self.read()[0],
}
return self.env.ref('gb_custom_hr.action_report_product_templates').report_action(self, data=data)

The entire pdf is blank while using the wizard. If it prints without the wizard, it contains all the contents.

Can anyone know, how to solve it.