PXD-444 ⁃ support deleting property values for submitted node

[philloooo]

No description provided.

[fortuno]

My suggestion would be:

• ignore (keep previous value): if that property is not in the TSV/JSON (no header or key).
• delete: if that property is in the submitted file (TSV/JSON) with either empty or "null" value.

[dmiller15]

Agreed with Francisco on both points. For more on the second point, I agree as long as the deletion is done through the same submission system. The ideal situation would be to create a specific deletion option of some sort. Much like what we do with the node deletion there would be some sort of interface separate from submission that would allow people to remove individual properties.

[allisonheath]

Also might consider using PATCH and PUT verbs. Where PUT fully replaces everything that was there before and PATCH just updates whatever is specified. See: https://docs.cancergenomicscloud.org/docs/overwrite-a-files-metadata