Nullpointer exception when skipping the last space of the XAR

In a subwiki, I do "Administration/Import".
If I import the complete file, then no errors.
If I import only one space, then I get a null pointer exception at the end of the job. All the files have been imported.
See: http://xwiki.475771.n2.nabble.com/XWIKI-7-0-Admin-IMPORT-fails-with-NULL-POINTER-tt7594647.html#a7594656

The workaround is to remove directly from the XAR package (it's a zip file) the pages you don't want to import.