Optimize the format of the code, check the list None before use

[buildearth]

Check whether the list is empty before obtaining the value of the list to ensure the robustness of the program. Optimized code format.

[mr-avocado]

Dear contributor,
Avocado is currently at the end of sprint #106, therefore we are in feature freeze state.
Please avoid merging changes that do not fall into these categories:

• Bug fixes
• Documentation updates

The feature freeze will be active until the release planned on 28 June 2024.