temporary fix to TIKA-1233. Added extra catch clause to catch PDFBOX-1803 related StringIndexOutOfBoundsException.  When PDFBOX-1803 is fixed, we should be able to remove these catches

git-svn-id: https://svn.apache.org/repos/asf/tika/trunk@1566910 13f79535-47bb-0310-9956-ffa450edef68