CALM Validate Crash

[aidanm3341]

Bug Report

The CALM CLI Validate command crashes when using this minimal pattern (yes it's a horrendously invalid pattern, but we should be getting actual feedback on how its invalid):

{
    "properties": {
        "nodes": {
            "prefixItems": [{}]
        },
        "relationships": {
            "prefixItems": [
                {
                    "properties": {
                        "relationship-type": {
                            "const": {
                                "connects": {
                                    "destination": {
                                        "node": "abc",
                                        "interfaces": []
                                    }
                                }
                            }
                        }
                    }
                }
            ]
        }
    }
}

Steps to Reproduce:

1. create a pattern.json file with the above contents
2. run calm validate -p pattern.json

Expected Result:

The output should be a json object which includes jsonschema and spectral errors.

Actual Result:

The CLI crashes with the following error:

Environment:

CLI v0.7.2 was used here, however this was observed in versions as far back as 0.4.0