hidden form fields get labels and td tags when rendered

[malte]

web.py renders hidden fields with labels, td-tags and other markup html that should be used for all other form fields except for hidden fields, which should be just by themselves.

The attached patch fixes the issue.

[Anand Chitipothu (anandology)]

The above fix adds <input> element in between table rows, which is not valid HTML.

The right fix should be:

<tr style="display: none"><td><input type="hidden" name="x" value="y"/></td></tr>

[Anand Chitipothu (anandology)]

Fixed.

>>> f = Form(Hidden("x", value="a"))
>>> print f.render()
<table>
    <tr style="display: none;"><th></th><td><input type="hidden" id="x" value="a" name="x"/></td></tr>
</table>