Fix unhandled exceptions in WorkflowServiceTChannel

[shijiesheng]

What changed?

• fix unhandled exceptions in WorkflowServiceTChannel
• add more test coverage in the whole package

Why?
unit test coverage

How did you test it?
unit test

Potential risks

Release notes

Documentation Changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.79%. Comparing base (1d0e355) to head (7fcd543).
Report is 10 commits behind head on master.

Additional details and impacted files

Files with missing lines	Coverage Δ
...cadence/serviceclient/WorkflowServiceTChannel.java	89.71% <100.00%> (+14.73%)	⬆️

... and 12 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 2641

Details

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• 93 unchanged lines in 7 files lost coverage.
• Overall coverage increased (+0.5%) to 80.761%

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Files with Coverage Reduction	New Missed Lines	%
src/main/java/com/uber/cadence/internal/testservice/TestWorkflowMutableStateImpl.java	1	85.33%
src/main/java/com/uber/cadence/serviceclient/IWorkflowServiceBase.java	2	96.84%
src/main/java/com/uber/cadence/internal/common/RetryParameters.java	8	84.62%
src/main/java/com/uber/cadence/client/ActivityCompletionException.java	14	58.82%
src/main/java/com/uber/cadence/internal/worker/PollerOptions.java	15	79.73%
src/main/java/com/uber/cadence/internal/worker/PollerAutoScalerOptions.java	17	0.0%
src/main/java/com/uber/cadence/internal/replay/ExecuteActivityParameters.java	36	44.62%

Totals
Change from base Build 2635:	0.5%
Covered Lines:	15662
Relevant Lines:	19393

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💛 - Coveralls