Handle `UnhandledPromiseRejectionWarning` when querying for something that's not there.

[TokenChingy]

Need to find an elegant solution to handle a case where you query for something but the response won't send because an error is thrown but not handled therefor stalling the response.

Example, deleting a record from the collection and trying to delete it again.

[TokenChingy]

I'm probably going to fix this when I write the logic for the data operator's that do comparators.