DeleteTbodyRebuild1

It should never be the case that deleting a tbody causes a rebuild of the cell map since cells cannot span out of tbodies. However, this is a bug.

The 2 tables should look the same

| c11 | c12 | | c21 | c22 | | c31 | c32 | | c41 | c42 |

| c31 | c32 | | c41 | c42 |