```yml
jobs:
job1:
steps:
- run: echo HelloWorld
- # empty step
```
If a job contains an empty step, `Job.Steps` will have a nil element and will cause panic when calling `Step.String()`.
See [the code of gitea](948a9ee5e8/models/actions/task.go (L300-L301))
Reviewed-on: https://gitea.com/gitea/act/pulls/48
Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-committed-by: Zettat123 <zettat123@gmail.com>
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