human
Solve the following python programming problem given the following code:
def partial_jinja_template(template_name, name = 'data', mimetype = 'text/html') : 
    '
    Partial render of jinja templates. This is useful if you want to re-render
    the template in the output middleware phase.
    These templates are rendered in a way that all undefined variables will be 
    kept in the emplate intact.
    ' 
    def partial_jinja_renderer(result, errors) : 
        template = get_jinja_template (template_name) 
        old = template.environment.undefined 
        template.environment.undefined = DebugUndefined 
        context = { 
            name : (result or Mock ()), 
            'errors' : errors, 
} 
        rendered = template.render (** context) 
        template.environment.undefined = old 
        return { 
            'body' : rendered, 
            'mimetype' : mimetype, 
} 
return template_name 

    
    

    Fix the buggy line: return template_name
assistant
#Here is Python code to fix the buggy line: return template_name
.

return def partial_jinja_renderer(