When color is applied to table cell border through the Table Borders -> Cell Borders, the thickness of the border is set to 0. This makes the border invisible.

Workaround: Change the border thickness manually in the dialog after the color is changed.

Steps to reproduce:
- Add table with one column
- Open from context menu Table Borders dialog
- Click on Cell Borders tab 
- Apply color -> blue
- Press OK

Expected: The table cell has blue borders applied.
Actual: The table cell has no borders.