Author: Paul Holden
MDL-37802 repository: return error if unzipping files fails.
For instance, when a user tried to unzip a password protected zip
archive using the file manager.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=582bb534c97d4d3d18357d8d886d322591bd6255
http://github.com/moodle/moodle/commit/582bb534c97d4d3d18357d8d886d322591bd6255
+ 4.0 en [cannotunzipextractfileerror,core_repository]