What's Changed
* Add a has_observations flag by frode-aarstad in https://github.com/equinor/webviz-ert/pull/224
* Improve usability of the ensemble selector by DanSava in https://github.com/equinor/webviz-ert/pull/222
* Small performance improvement for the graph grid when adding and removing plots by DanSava in https://github.com/equinor/webviz-ert/pull/230
**Full Changelog**: https://github.com/equinor/webviz-ert/compare/0.4.1...0.4.2