common-workflow-language / common-workflow-language/cwltool

Staging of optional input fails in cwltool when optional input is not set

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Python
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Description

Staging of optional input using:
```
listing:
- $(inputs.optional_input)
```
or
```
listing:
- entry: $(inputs.optional_input)
```
fails in cwltool when optional input is not set (is null). I am not sure if this is expected behavior or a bug?

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