Fix script function return always removing references from NPC variables.

[k-py]

Bugreport:8642 http://hercules.ws/board/tracker/issue-8642-script-engine-issue-quo/

[k-py]

I removed an unnecessary check and rebased the branch.

[k-py]

After further testing, I uncovered a crash condition caused by the incorrect usage of return outside the scope of a function or subroutine.

-   script  test    -1,{
    return getvariableofnpc(.x, "test2");
}
-   script  test2       -1,{
    end;
}

Already fixed.

[MishimaHaruna]

Thank you very much