Fix zero-padding and handling of empty passwords (meaning protection on, but no password to remove it) for XSSF workbook protection.

https://bz.apache.org/bugzilla/show_bug.cgi?id=59920

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1754744 13f79535-47bb-0310-9956-ffa450edef68
3 files changed