`moveTableRow` fails when moving down with merged cells

[Aslam97]

Description

When using moveTableRow, if the row contains merged cells, the command fails when moving the row downward.
Its to work fine in other cases, but moving down specifically causes unexpected behavior.

Steps to Reproduce

1. Create a table with a merged cell.
2. Try to move a row down using moveTableRow.
3. Observe that the command does not work as expected.

Expected Behavior

• The row should be moved down correctly,
• Merged cells should remain intact and not cause the operation to fail just like moving row up.

Actual Behavior

• moveTableRow does not move the row when merged cells are present.