Bug: NCIT importer broken?

[joeflack4]

Description

When running the ccdh.importers.importer, it tries to import an ncit-termci.ttl file that was generated from TCCM. However, trying to do so appears to fail.

    def import_ncit(self):
        path = 'file:///var/lib/neo4j/import/ncit-termci.ttl'  # neo4j container location
        # path = 'file:///app/data/tccm/ncit-termci.ttl'  # ccdh-api container location
        xxx = self.graph.call('n10s.rdf.import.fetch', path, "Turtle",
                        {'predicateExclusionList': ["https://hotecosystem.org/termci/contents"]})

I was getting no messages in log when running the importer, so I debugged and examined the value of the xxx variable, and got the following error messages.

Err messages

terminationStatus | triplesLoaded | triplesParsed | namespaces | extraInfo                                                                                                                                                    | callParams
-------------------|---------------|---------------|------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------|------------
KO                |             0 |             0 |       null | The following constraint is required for importing RDF. Please run 'CREATE CONSTRAINT n10s_unique_uri ON (r:Resource) ASSERT r.uri IS UNIQUE' and try again. |       null

Possible solutions

1. Follow the instructions in the error message

Could potentially put this line of Python code right before the import line.

        self.graph.call('CREATE CONSTRAINT n10s_unique_uri ON (r:Resource) ASSERT r.uri IS UNIQUE')

But I have a feeling something is missing here.

Further discussion

Questions

1. Is this indeed importing nothing, per the error message?
2. Why doesn't this error message appear unless I'm looking in the debugger?
3. Is that normal?
4. If this is indeed broken, how long has it been broken?
5. What functionality are we losing with this broken?