optimize: remove unnecessary null checks #7064
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Ⅰ. Describe what this PR did
The return value of the ExceptionUtils.getNetExceptionType method will never be null. Remove the null check for the return value of this method.
Ⅱ. Does this pull request fix one issue?
Ⅲ. Why don't you add test cases (unit test/integration test)?
Ⅳ. Describe how to verify it
Ⅴ. Special notes for reviews