fix if statement when query arguments have value 0 #2
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When $key from $_REQUEST have value '0' then else if statement doesn't work in line 28. So I change from
28. } else if (($query_var)) {
to
28. } else if (isset($query_var)) {
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When $key from $_REQUEST have value '0' then else if statement doesn't work in line 28. So I change from
28. } else if (($query_var)) {
to
28. } else if (isset($query_var)) {