Very minor nil-or-empty cleanup

[Groxx]

Just randomly exploring, found with

❯ sg run --pattern '$X == nil || len($X) == 0'
./common/dynamicconfig/configstore/config_store_client.go
413│	if dcValues == nil || len(dcValues) == 0 {

This is clearly a no-op change. All nil slices are zero-length.

[coveralls]

Pull Request Test Coverage Report for Build 018e175b-2d68-4bd4-904e-7921752f5e0d

Details

• 11 of 13 (84.62%) changed or added relevant lines in 1 file are covered.
• 71 unchanged lines in 10 files lost coverage.
• Overall coverage decreased (-0.009%) to 63.895%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
common/dynamicconfig/configstore/config_store_client.go	11	13	84.62%

Files with Coverage Reduction	New Missed Lines	%
service/history/task/transfer_active_task_executor.go	2	72.38%
service/matching/taskListManager.go	2	80.46%
service/history/task/transfer_standby_task_executor.go	2	87.42%
service/matching/taskReader.go	2	84.88%
service/history/execution/mutable_state_util.go	2	78.48%
common/persistence/statsComputer.go	3	94.64%
service/history/task/fetcher.go	4	85.05%
common/persistence/nosql/nosqlplugin/cassandra/workflow.go	6	63.03%
service/history/execution/mutable_state_task_refresher.go	14	60.44%
common/persistence/nosql/nosqlplugin/cassandra/workflow_parsing_utils.go	34	79.13%

Totals
Change from base Build 018e1703-751e-4216-8e8c-7d9ec8ca044b:	-0.009%
Covered Lines:	93670
Relevant Lines:	146599

---

💛 - Coveralls

[codecov]

Codecov Report

Merging #5745 (721c4e2) into master (b34ee0b) will decrease coverage by 0.47%.
The diff coverage is 100.00%.

❗ Current head 721c4e2 differs from pull request most recent head a346ccf. Consider uploading reports for the commit a346ccf to get more accurate results

Additional details and impacted files

Files	Coverage Δ
...n/dynamicconfig/configstore/config_store_client.go	63.59% <100.00%> (ø)

... and 12 files with indirect coverage changes

---

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