report_product_variant/views/product_sin_variant_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
	<data>
		<report id="list_product_sin_variant" model="product.template" string="Producto sin Variantes " report_type="qweb-pdf"
            name="report_product_variant.product_sin_variant_view" file="report_product_variant.product_sin_variant_view" />

		<template id="report_product_variant.product_sin_variant_view">
			<t t-call="report.html_container">
				<t t-call="report.internal_layout">
					  <div class="page">
							<style type="text/css">
								.crm_tcab{
								font-size: 3mm;
								font-family: Arial, Helvetica, sans-serif;
								}
								.crm_tbody{
								font-size: 2.8mm;
								font-family: Arial, Helvetica, sans-serif;
								}
							</style>
						  <h2 class="text-center"><strong>Listado Producto sin Variantes</strong></h2>
            	<table class="table table-condensed">
						  <thead class="crm_tcab">
								<tr class="active">
						      <th><strong>Producto</strong></th>
						    </tr>
						  </thead>
							<t t-foreach="docs" t-as="o">
						  <tbody class="crm_tbody">
								<tr>
									<p t-if="o.product_variant_count == 0 ">
						     		<td> <span t-field="o.name"/> </td>
									</p>
							 	</tr>
							</tbody>
							</t>

						  </table>
						</div>
				</t>
			</t>
		</template>
	</data>
</openerp>