samples with missing Bioproject ids

[realmarcin]

For example, this sample:
https://www.ncbi.nlm.nih.gov/biosample/SAMN00000005/

has no Bioproject id in the harmonized attributes from the NCBI Biosample xml.

However, NCBI Bioproject does have links to Bioprojects for this sample, in fact 5 of them. However, these links are potentially not the same as an actual Bioproject id for that Biosample id, but rather something like 'related information' or 'same organism'.

What is odd is this example, is the sample is actually:
Generic sample from Biomphalaria glabrata

Which sounds more like a generic placeholder sample for that organism?

This is still a little unclear and other examples may reveal more/different information.