131:        problems = validate_html(html_body)
132:        if problems:  # validate_html returns a list of problem strings
134:                                detail=f"HTML rejected: {'; '.join(problems)}")
181:    problems = validate_html(tpl.body_html)
182:    if problems:  # list of problem strings
184:                            detail=f"Template has errors: {'; '.join(problems)}")