Revert "changed comment for another commit"

This reverts commit b84dce172eef402942a91a62740f542cbc74960d.
Revert "removed null check from rowToString"

This reverts commit 0503095b786e41eeeec68f2fd05790d166e98c14.
Revert "added null check in toString"

This reverts commit 0192df473e64d8d49a241f7a6413687f0d94d191.
changes for testing new functionality