Inform the user that pushing of Physical elements to structural adapters

#### Description:

As in the title, the script shown in the screenshot does nothing in Robot, but it gives no feedback to the user - it looks as if the Physical elements were pushed successfully. A warning about non-structural type being pushed would be welcome, ideally with a hint on how to make the Push work (e.g. convert `Physical.Elements.Beam` to `Structural.Elements.Bar` using `AnalyticalBars` method etc.).