get remote slottable from local meta leader fail when meta leader not…

[nocvalight]

… warmup

Motivation:

Explain the context, and why you're making that change.
To make others understand what is the problem you're trying to solve.

Modification:

Describe the idea and modifications you've done.

Result:

Fixes #299 .

If there is no issue then describe the changes introduced by this PR.

[codecov]

Codecov Report

Merging #300 (cfd9d16) into master (de957a3) will decrease coverage by 0.06%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master     #300      +/-   ##
============================================
- Coverage     76.42%   76.37%   -0.06%     
  Complexity       48       48              
============================================
  Files           492      493       +1     
  Lines         18239    18248       +9     
  Branches       1783     1783              
============================================
- Hits          13940    13937       -3     
- Misses         3497     3507      +10     
- Partials        802      804       +2     

Impacted Files	Coverage Δ
...y/sofa/registry/common/model/store/Subscriber.java	72.43% <0.00%> (ø)
.../client/handler/RemoteDataChangeNotifyHandler.java	94.11% <ø> (ø)
...ulti/cluster/slot/MultiClusterSlotManagerImpl.java	77.39% <ø> (-0.23%)	⬇️
...lipay/sofa/registry/server/data/timer/Metrics.java	93.75% <ø> (ø)
...sofa/registry/server/session/push/PushMetrics.java	92.30% <50.00%> (ø)
...gistry/exception/MetaLeaderNotWarmupException.java	66.66% <66.66%> (ø)
...ta/multi/cluster/slot/MultiClusterSlotMetrics.java	84.09% <100.00%> (ø)
...ti/cluster/DefaultMultiClusterSlotTableSyncer.java	91.92% <100.00%> (+0.15%)	⬆️
...y/sofa/registry/server/session/push/PushTrace.java	73.38% <100.00%> (ø)
...ofa/registry/server/session/store/DataIndexer.java	85.48% <0.00%> (-4.84%)	⬇️
... and 7 more

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