Contest-5 Bug#4276.

Signed-off-by: Dhananjay Nakrani <dhananjaynakrani@gmail.com>

The problem was that the script `import.php` is loaded on [ index.php L#42 ](https://github.com/phpmyadmin/phpmyadmin/blob/QA_4_1/index.php#L42) without posted data which it expects and so it runs into an error.
Added a blacklist check. Now the scripts which expects data from front-end are not loaded on index page.

By the way it was first proposed [here](https://github.com/phpmyadmin/phpmyadmin/pull/903).
Hope this time it satisfies the required community standards..:smiley: