Productattributescontainer might be performing queries on garbage collection

[specialunderwear]

The productattributescontainer contains a caching mechanism and a lazy machanism to prevent queries from being done when attributes are not.

We suspect that during garbage collection de __delete__ method is being called, which is not there.
That could trigger the population of the cache, executing a query.

This problem has manifested itself during tests run on github, but nobody has yet been able to reproduce this locally.