CSS instruction color: transparent not working any longer #811
Description
Describe the Bug
We migrated lately from 0.2.4 to 0.2.17. Table cells with css "color: transparent" are rendered in black now, whereas in the old version the cells was rendered "empty".
Minimal Example to Reproduce
We are using rst2pdf (0.103.1), so here is a minimal rst file:
.. raw:: html
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
</head>
<table class="Projektbericht" repeat="2" style="font-family: Helvetica, Arial, sans-serif; font-size: 8pt; margin-top: 12px; width:20%;">
<tbody>
<tr class="odd" style="padding: 2px, 2px, 0, 2px; border: none">
<td class="right columnGroupStart" style="text-align: right; border-left: 1px solid #868686; background-color: #fff; ">42,00</td>
<td class="right" style="text-align: right; background-color: #fff; color: transparent;">0,00</td>
</tr>
</tbody>
</table>
</html>
Expected Behavior
The first cell content should be visible, i.e. rendered in black, the second cell value "0,00" should not be visible, i.e. the cell should be rendered empty.
Actual Behavior
The transparent value of the color css attribute is ignored, the cell value is rendered in black.
Additional Information
I've tried to use the color "#0000", which is not supported, it results in this error message:
[ERROR] createpdf.py:604 Error generating document elements: Can only convert 3 and 4 sequences to color
System Information
OS version: Windows Server 2016 Standard
Python version: 3.13.5
XHTML2PDF version: 0.2.17