Fix parsing of empty from and reply-to headers in envelope response.
Fix parsing of empty from and reply-to headers in envelope response.

svn path=/trunk/KDE/kdepim/; revision=548684

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi