[Failure]commentController: Fail to get comment: user dose not exist

[harveylo]

• Commit: 60f7233
• Priority: medium
• Description: get should fail and return 404 but the result is 200
• Error output: { "status": 200, "responseMap": { "result": [] } }

[HatsuneMK00]

fix in commit febb4c2848181661048e2153217c08aec789089e -> 检查用户不存在时返回404