PDFBOX-1503: remove printStackTrace() calls

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1607508 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-1926: throw IOException when save() is called on a closed document

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1607511 13f79535-47bb-0310-9956-ffa450edef68