Fix info deletion on cached entities

[hcordobest]

popitem() removes the item from the list. When using the MemoryCache option, this will cause an Exception because the expected element will not be present when accessing the entity more than once.

This change will keep the elements. The order is not guaranteed (which is good?)

[dahlia]

@hcordobest Sorry for my late response. Could you write a changelog for this bugfix? See the docs/changes.rst file.

[hcordobest]

Done!