simple: fast fixes

[colleenXu]

should be merged quickly, since these are simple + don't change behavior much + fix a few potential bugs

[coveralls]

Pull Request Test Coverage Report for Build 1044231511

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.831%

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Totals
Change from base Build 972320854:	0.0%
Covered Lines:	439
Relevant Lines:	444

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💛 - Coveralls

[newgene]

@colleenXu For other IDs removed:

remove IDs
BiologicalProcess KEGG
CellularComponent MetaCyc
AnatomicalEntity NCIT
Cell EFO

If the reason to remove MetaCyc, NCIT, EFO is the same as KEGG ("cannot find matching field in the corresponding API"), I would not remove them as well. It's likely the underlying API has an issue to load the corresponding fields, then we should fix the data instead, or find another API.

But if their existence breaks some queries, it's strong enough reason to remove it (or better "comment out") for now.

[colleenXu]

@newgene I have changed the branch, so this will merge to biolink_v2.1 for testing.

With the new commit below, those 3 IDs are back in, with comments that I didn't find those fields in the corresponding APIs. I don't think anything will break by having them in.