Struts default textarea template fails w3c validation

The textarea default template (https://github.com/apache/struts/blob/master/core/src/main/resources/template/simple/textarea.ftl) fails W3C validation because the "rows" and "cols" attribute default to "" if none is provided, which is not a valid value:

<s:textarea id="test" name="test"/>

Which generates:

<textarea name="test" cols="" rows="" id="test"></textarea>

Which fails if run through the validation tool: https://validator.w3.org/nu/#textarea