Fix empty node issue after master failover #4114

Job	Run time
atorch-pre-commit	2m 45s
dlrover-python-test	7m 15s
atorch-python-test	5m 33s
brain-test	1m 31s
dlrover-system-test-criteo-deeprec	2m 50s
dlrover-system-test-tf2	1m 24s
operator-test	1m 29s
dlrover-system-test-deepfm	2m 39s
pre-commit	1m 8s
tfplus-pre-commit	1m 3s
tfplus-python-test	6s
	27m 43s

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