Description:
Rendering of html border is making a border out of 0px solid black

Steps to Reproduce:
1. save the following code sniped into a file with extension .html and load it into libre office via drag and drop or insert -> text from file

<table>
	<tbody>
		<tr>
			<td>
				<div alt="tester" style="width: 100px; height: 68px; margin: 0px; border: 0px solid black;">0px solid black</div>
			</td>
		</tr>
	</tbody>
</table>

<table>
	<tbody>
		<tr>
			<td>
				<div alt="tester" style="width: 100px; height: 68px; margin: 0px; border: 0pt solid black;">0pt solid black</div>
			</td>
		</tr>
	</tbody>
</table>


Actual Results:
a field with a border

Expected Results:
a field without a border


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 6.0.6.2
Build ID: 0c292870b25a325b5ed35f6b45599d2ea4458e77
CPU threads: 8; OS: Mac OS X 10.14.4; UI render: default; 
Locale: de-DE (de_DE.UTF-8); Calc: group