oncotree node "TISSUE" is showing NCI/UMLS codes in tumorTypes API

[sheridancbio]

curl -X POST --header "Content-Type: application/json" --header "Accept: application/json" -d "{
"queries": [
{
"exactMatch": true,
"query": "TISSUE",
"type": "code"
}
],
"version": "oncotree_latest_stable"
}" "http://oncotree.mskcc.org/oncotree/api/tumorTypes/search"

Returns:
"data": [
[
{
"id": null,
"code": "TISSUE",
"color": null,
"name": "Tissue",
"mainType": null,
"tissue": null,
"children": {},
"parent": null,
"deprecated": false,
"history": [],
"links": null,
"level": null,
"NCI": [
"C12801"
],
"UMLS": [
"C0040300"
]
}

This oncotree node actually represents the root of the oncotree, and contains lymph and blood subtrees. So the definition from https://ncit.nci.nih.gov/ncitbrowser/pages/concept_details.jsf?dictionary=NCI%20Thesaurus&code=C12801 : "An anatomical structure consisting of similarly specialized cells and intercellular matrix, aggregated according to genetically determined spatial relationships, performing a specific function." does not seem to be accurate.

We should consider returning null for these (and all) meta values.

On the oncotree main webpage, the hover-over of node TISSUE displays "Not Available" for NCI and UMLS because the TISSUE node is not present in the tumor_Types.txt API output.