- Use pipelining for header fetching, if available. - Don't crash when fetching the headers of one certain mail I have here.
- Use pipelining for header fetching, if available.
- Don't crash when fetching the headers of one certain mail I have here.

svn path=/trunk/kdenetwork/kmail/; revision=125180

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