PDFBOX-2147: replace redundant if statements

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1603539 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2147: replace redundant if statements

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1603541 13f79535-47bb-0310-9956-ffa450edef68