Patch for CategoryViewer.php

Category pages list categories in three columns, using table cells. The same goes for category trees. These cells have no widht set, making the columns have unequal widths. This is troublesome when expanding tree nodes, which makes the columns jump.

This patch add a 'width="33.3%"' to the table cells. It also fixes an issue where a fourth, empty table cell is generated.

Version: 1.20.x
Severity: normal

Attached: