Fix crash when recovering dead.letters on startup.

There's even already a check for aParent above.

svn path=/trunk/kdepim/; revision=314042

kmfolder.cpp

@@ -90,7 +90,7 @@ KMFolder::KMFolder( KMFolderDir* aParent, const QString& aFolderName,
   //FIXME: Centralize all the readConfig calls somehow - Zack
   mStorage->readConfig();
 
-  if ( mId == 0 )
+  if ( mId == 0 && aParent )
     mId = aParent->manager()->createId();
 }