Use copy() instead of loop when copy a slice for a better performance.
Remove a punctuation in an error string to fit with go specifications.
Ignore some unused returns
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[x] Format the pull request title like [ISSUE #123] Fix UnknownException when host config not exist. Each commit in the pull request should have a meaningful subject line and body.
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[x] Write necessary unit-test(over 80% coverage) to verify your logic correction, more mock a little better when a cross-module dependency exists.
What is the purpose of the change
Brief changelog
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Verifying this change
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Follow this checklist to help us incorporate your contribution quickly and easily. Notice,
it would be helpful if you could finish the following 5 checklist(the last one is not necessary)before request the community to review your PR.[ISSUE #123] Fix UnknownException when host config not exist. Each commit in the pull request should have a meaningful subject line and body.