Fix: Add none tag to non tagged labels by language

[Bilelkihal]

Issue description:

    <owl:Class rdf:about="http://purl.obolibrary.org/obo/CDNO_0000024">
        <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/CDNO_0000012"/>
        <rdfs:label rdf:datatype="http://www.w3.org/XML/1998/namespacestring">dietary fluorine</rdfs:label>
    </owl:Class>

This class in the ontology FOODON has a label that is not plain text but is typed with an rdf:datatype. As a result, it is not tagged with any language in Goo. This causes an issue where the label is returned as an array, breaking the code.

Changes

• Updated the code to handle cases where class labels are returned as an array by converting the array of labels to a hash, assigning a language: none key to ensure proper handling.

[Bilelkihal]

✅

[syphax-bouazzouni]

Seems fine to me, just add that line to the unit test you added.

[Bilelkihal]

Using the code done in this PR + ontoportal-lirmm/goo#68
I successfully parsed the ontologies: FOODON, CDNO and PCSM on my local.
I will deploy them to stage and test this on stage too.

[Bilelkihal]

APTO also is parsed successfully

[Bilelkihal]

OBA also is parsed successfully

[syphax-bouazzouni]

OBA also is parsed successfully

@Bilelkihal comment the parsed ontologies in the issue agroportal/project-management#628 not in this already closed PR.