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### What problem does this PR solve? This pull request addresses an issue where the reference is an empty array ([]) in specific cases, leading to errors in the application. When the reference is empty, the code attempts to call the get method on a list, resulting in the following error message: ``` json {"retcode": 500, "retmsg": "'list' object has no attribute 'get'", "data": {"answer": "**ERROR**: 'list' object has no attribute 'get'", "reference": []}} ``` ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>