Initialize variable

Signed-off-by: Marc Delisle <marc@infomarc.info>
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Merge remote-tracking branch 'origin/master'
Fix coding style

Signed-off-by: Marc Delisle <marc@infomarc.info>
Merge branch 'master' of https://github.com/phpmyadmin/phpmyadmin
Ensure variable is a string

Signed-off-by: Marc Delisle <marc@infomarc.info>