Observation may be connected to many sublevels and with many constructs. The problem was if observation was associated with sublevel from filtered construct then the KeyError was raising. Besides that I've fixed wrong filtering of no_construct observations.
Description
Observation may be connected to many sublevels and with many constructs. The problem was if observation was associated with sublevel from filtered construct then the KeyError was raising. Besides that I've fixed wrong filtering of no_construct observations.