Can't split a URI that ends in a Forward Slash?

[markpbaggett]

I have some partial turtle that looks like this:

@prefix fedoraObject: <http://[LocalFedoraRepository]/> .
@prefix utkevents: <http://[address-to-triplestore]/events/> .
@prefix utktitles: <http://[address-to-triplestore]/titles/> .
@prefix utksubjects: <http://[address-to-triplestore]/subjects/> .
@prefix utkspatial: <http://[address-to-triplestore]/spatial/> .
@prefix utknotes: <http://[address-to-triplestore]/notes/> .
@prefix utknames: <http://[address-to-triplestore]/names/> .
@prefix utkphysicalcollections: <http://[address-to-triplestore]/physicalcollections/> .
@prefix rdfs: <https://www.w3.org/TR/rdf-schema/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix bf: <http://id.loc.gov/ontologies/bibframe/> .
@prefix relators: <http://id.loc.gov/vocabulary/relators> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix geojson: <https://purl.org/geojson/vocab#> .
@prefix pcdm: <http://pcdm.org/models#> .
@prefix dbo: <http://dbpedia.org/ontology/> .
@prefix dce: <http://purl.org/dc/elements/1.1/> .
@prefix identifiers: <http://id.loc.gov/vocabulary/identifiers> .
@prefix edm: <http://www.europeana.eu/schemas/edm/> .
@prefix rdau: <http://rdaregistry.info/Elements/u/#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix dcmitype: <http://purl.org/dc/dcmitype/> .
@prefix owl: <https://www.w3.org/2002/07/owl#> .

<fedoraObject:tq/57/nr/06/tq57nr067>
    dce:title utktitles:1 ;
    identifiers:local "0012_000463_000214", "record_spc_4489", "Slide 1", "Film 96" ;
    dcterms:identifier "knoxgardens:115" ;
    dcterms:abstract "Photograph slide of the Tennessee state tree, the tulip tree" ;
    bf:provisionActivity utkevents:1, utkevents:2, utkevents:3 ;
    edm:hastype <http://vocab.getty.edu/aat/300134977> ;
    rdau:extent "3 1/4 x 5 inches" ;
    dce:format "image/jp2" ;
    relators:pht utknames:1 ;
    dcterms:subject utksubjects:1, utksubjects:2, utksubjects:3, utksubjects:4 ;
    dcterms:spatial utkspatial:1 ;
    bf:Note utknotes:1 ;
    pcdm:memberOf <fedoraObject:jk/88/99/adklasd908ads> ;
    relators:rps <http://id.loc.gov/authorities/names/no2014027633> ;
    bf:physicalLocation "University of Tennessee, Knoxville. Special Collections" ;
    edm:rights <http://rightsstatements.org/vocab/CNE/1.0/> .

When I try to create my dot file from this

$ ./ontology_viz.py -o tulip.dot ~/PycharmProjects/utk_hyrax_investigation/docs/test.ttlC 

it fails with ValueError: Can't split 'http://rightsstatements.org/vocab/CNE/1.0/'.

If I remove the trailing slash in the URI, the dot file is created just fine. As you can see in here, it says the URI should be http://rightsstatements.org/vocab/CNE/1.0/. Am I misunderstanding the error here?