phpmyadmin/phpmyadmin — pull request #177 by hisamith (2013-02-20 18:11:10+00:00)
Title: Fixed #3833 Undefined variable: sql_limit_to_append.

Initialized the varible sql_limit_to_append,
Since isset($x) returns true when $x=''(which is not the expected behaviour of the usage), used the function empty()