small bugfixes: (a) avoid dereferencing of NULL pointer (b) use dedicated enum value instead of 0 for initialization (c) implement handling of unknown signature status value.   (Please update your libkdenetwork sources as well.)
small bugfixes: (a) avoid dereferencing of NULL pointer (b) use dedicated enum value instead of 0 for initialization (c) implement handling of unknown signature status value.   (Please update your libkdenetwork sources as well.)

svn path=/trunk/kdenetwork/kmail/; revision=162284

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