XGC-116: Don't draw fully transparent alpha on PS
XGC-116: Don't draw fully transparent alpha on PS

git-svn-id: 102839466c3b40dd9c7e25c0a1a6d26afc40150a@1845493 13f79535-47bb-0310-9956-ffa450edef68

chunlinyao/fop,apache/fop,apache/fop,chunlinyao/fop,chunlinyao/fop,chunlinyao/fop,apache/fop,chunlinyao/fop,apache/fop,apache/fop