Idered/cssParentSelector — pull request #26 by TooBug (2013-10-11 11:52:36+00:00)
Title: fix a bug when there's no element on page 

e.g.

input[checkbox]:checked{
abc:abc;
}

when no checkbox on page, it will output:

/*some css 1*/

{
abc:abc;
}

/*some css 2*/

thus makes 'some css 2' invaild.

Another case:

input[checkbox]:checked,input[checkbox]:disabled:checked{
abc:abc;
}

if no checkbox is disabled, it will output:

/*some css 1*/

CPS0,CPS1,{
abc:abc;
}

/*some css 2*/

makes the selector is invalid.