bug #3794 failure to handle repeating empty columns when importing ODS

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>
Merge branch 'QA_4_3' of github.com:phpmyadmin/phpmyadmin into QA_4_3

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>