Possible dead cache code branch

[gordonwatts]

The following code in query_core.py:

        # Let's see if this is in the cache already, but respect the user's wishes
        # to ignore the cache
        cached_record = (
            self.cache.get_transform_by_hash(sx_request_hash)
            if not self.ignore_cache
            else None
        )

looks dead to me. We should probably remove it if I'm right. Discovered while working on something else, so didn't want to mess with it.