- fixed: return old synckey in case of errors

git-svn-id: https://z-push.org/svn/z-push/trunk@1304 b7dd7b3b-3a3c-0410-9da9-bee62a6cc5b5

- fixed: when updating a folder the type of the old object is used if it is not set

git-svn-id: https://z-push.org/svn/z-push/trunk@1303 b7dd7b3b-3a3c-0410-9da9-bee62a6cc5b5

git-svn-id: https://z-push.org/svn/z-push/trunk@1302 b7dd7b3b-3a3c-0410-9da9-bee62a6cc5b5