fix: incorrect initialize null replicaStatuses lead to update JobStat…

[PeterChg]

…us in ApiServer failed

What this PR does / why we need it:

The following problems may occur when call UpdateJobStatusInApiServer function, This causes large number of repeated retries JobReconciles:

ERROR Reconciler error {"controller": "pytorchjob-controller", "object": {"name":"test-0717","namespace":"ns-test"}, "namespace": "ns-test", "name": "tj-test-fusion-0717", "reconcileID": "2fe0485f-1a89-46d2-bf50-81eeadbd979f", "error": "PyTorchJob.kubeflow.org \"tj-test-fusion-0717\" is invalid: status.replicaStatuses: Required value"}

This problem is resolved after the initialization mode is changed.

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged): Fixes #

Checklist:

• [ ] Docs included if any changes are user facing

[google-oss-prow[bot]]

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[coveralls]

Pull Request Test Coverage Report for Build 10163315038

Details

• 5 of 5 (100.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 34.917%

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Totals
Change from base Build 10131041132:	0.07%
Covered Lines:	3946
Relevant Lines:	11301

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💛 - Coveralls

[PeterChg]

Why does the integration test fail, seemingly unrelated to the code change. How do I re-launch the test /cc gaocegege

[PeterChg]

/rerun-all