Chris Lu 5d931eff27 avoid possible nil ...

fix https://github.com/chrislusf/seaweedfs/issues/1928

The nil was because of `dn.Parent().UnlinkChildNode(dn.Id())` in topo.UnRegisterDataNode() function, when the dn leaves the cluster.

2021-03-22 13:24:07 -07:00

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