While extending the corresponding checklist I realized some inconsistencies in the warning messages if no or wrong data was loaded in the data selection widgets.

Also, some utilities check the validity of data (dimensions / geometry) after a operation-perform button was clicked (e.g. Boolean Operations), some check the validity directly after data selection (e.g. Image Masking).
The new selection-concept (node selection dialog) also allows to set node-predicates and check the validity of a node selection even before the selection was done.

We should discuss the best concept and be consistent inside the utilities view (and update the description in the checklist accordingly).