I tried to add a condition to QWEB template "ControlPanel" to show a field which is project_id.description.

<t t-extend="ControlPanel">
    <t t-jquery="div.container-fluid" t-operation="after">
        <t t-if="widget.field_manager.dataset._model.name == 'project.task'">
            <div><field name="project_id.description"/></div>
        </t>
    </t>
</t>

This doesn't work

My Odoo version is 9 community edition