Revert "[BUGFIX] Page module: Allow to paste in empty columns"

This patch introduces sever problems with DataHandler.

Change-Id: I591440395b6e7fb7d0ffb33c107e94a7a3b25b5a
Releases: 6.2, 6.1
Related: #44002
Reviewed-on: https://review.typo3.org/25527
Reviewed-by: Markus Klein
Tested-by: Markus Klein