🐛 Bug 描述 Bug description

When using check-issue - body-includes on an issue that has an empty body, the workflow fails with error:
Error: [🚨 AC] Cannot read property 'toLowerCase' of null

🏞 期望结果 Desired result

Desired result is that issues with empty body content can be reported as boolean.

🚑 其他信息 Other information

Github "Convert to Issue" for task list items yields empty issues, which will break the above functionality.