PDFBOX-2222: create a default font if font doesn't exist

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1611893 13f79535-47bb-0310-9956-ffa450edef68
PDFBOX-2222: create a default font if font doesn't exist

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1611894 13f79535-47bb-0310-9956-ffa450edef68