TIKA-1233: removed catch blocks after upgrade to PDFBOX-1.8.5; see PDFBOX-1803

git-svn-id: https://svn.apache.org/repos/asf/tika/trunk@1593983 13f79535-47bb-0310-9956-ffa450edef68
TIKA-1231: added more null checks after underlying fix was made in PDFBox-1.8.5

git-svn-id: https://svn.apache.org/repos/asf/tika/trunk@1593996 13f79535-47bb-0310-9956-ffa450edef68