Fix kmail crash when start in offline mode

This resolves Bug 2454

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

kmail/kmkernel.cpp

@@ -1270,7 +1270,7 @@ void KMKernel::resumeNetworkJobs()
   BroadcastStatus::instance()->setStatusMsg( i18n("KMail is set to be online; all network jobs resumed"));
   emit onlineStatusChanged( (GlobalSettings::EnumNetworkState::type)GlobalSettings::networkState() );
 
-  if ( kmkernel->msgSender()->sendImmediate() ) {
+  if ( kmkernel->msgSender() && kmkernel->msgSender()->sendImmediate() ) {
     kmkernel->msgSender()->sendQueued();
   }
 }