schema_salad.exceptions.ValidationExceptions parsing certain data structures

```
import cwl_utils.parser_v1_2 as parser
parser.load_document("https://raw.githubusercontent.com/common-workflow-library/bio-cwl-tools/release/picard/picard_CreateSequenceDictionary.cwl")
```

```
InitialWorkDirRequirement:
listing:
- $(inputs.REFERENCE)
```

```
outputs:
...
sequences_with_dictionary:
type: File
format: edam:format_2573 # SAM
secondaryFiles:
- .dict
- .fai
```

```
parser.load_document("https://raw.githubusercontent.com/common-workflow-library/bio-cwl-tools/release/bamtools/bamtools_stats.cwl")
```

```
bamtools_stats.cwl:110:5: the `outputBinding` field is not valid...
the `outputEval` field is not valid...
```