[widgets][assetwidgets] Load experiment model when creating a new model

4 jobs for 268_fix_connection_model_handling in 24 minutes and 51 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed build_linux_36 #200937
docker

00:09:53

90.0%
passed build_linux_37 #200938
docker

00:09:42

90.0%
passed build_macosx_36 #200935
macosx

00:24:47

90.0%
passed build_macosx_37 #200936
macosx

00:24:29

90.0%