Fix CLI jwtKey NPE issue

[yycptt]

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Documentation Changes

[coveralls]

Pull Request Test Coverage Report for Build d3ab68c0-0293-46b8-82f6-59e0355d03a6

• 0 of 4 (0.0%) changed or added relevant lines in 1 file are covered.
• 61 unchanged lines in 11 files lost coverage.
• Overall coverage increased (+0.02%) to 56.324%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tools/cli/factory.go	0	4	0.0%

Files with Coverage Reduction	New Missed Lines	%
common/task/weightedRoundRobinTaskScheduler.go	1	89.64%
service/history/execution/mutable_state_task_refresher.go	1	74.4%
service/history/queue/timer_queue_processor_base.go	1	78.56%
common/persistence/executionManager.go	2	75.5%
common/persistence/statsComputer.go	2	95.71%
common/types/mapper/thrift/shared.go	2	64.98%
common/task/fifoTaskScheduler.go	4	82.47%
common/persistence/nosql/nosqlExecutionStore.go	9	57.52%
service/history/shard/context.go	9	65.23%
service/history/execution/context.go	14	66.93%

Totals
Change from base Build 2300446c-8199-4efd-8b4d-c649c07159cc:	0.02%
Covered Lines:	78471
Relevant Lines:	139320

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💛 - Coveralls