[BISERVER-11205],[PRD-4858] - PRPT importer used happy-path coding for import

The code (a) used raw-xml parsing of the zip file, as if there was no sane API for the reporting engine and (b) blindly fired XPath at those documents without any checks and validations whatsoever. 

On errors, like a title or description not being defined it just did not set any extra information at all.