Fixes not returning null result

In some places, you may have a query that returns null. From now on, the remember() will save the result of the query even if it's null, like retrieving a non-existent set of records. The next time you call the same remembered query, the null result will be returned.

This was intended from the beginning, and it fathoms me why I didn't picked this up earlier.

If that is not the result you desire, you may want to use your cache manually.