Marking incomplete step configurations properly

[lhein]

Please describe the feature that you want to propose

Steps have mandatory fields that need to be filled. Currently you cannot detect incomplete configurations easily. Neither the canvas figure is having a marker nor in the generic step extension you can spot the incomplete fields easily.

However when opening the browser console you can spot an error, so the information seems to be available.

Suggestions

Mark the canvas figures containing incomplete or wrong configurations on the canvas.

For incomplete configuration like missing madatory fields we could use:

For wrong configuration / errors we could use:

Mark the missing mandatory fields in the generic step extensioon form.

current state:

suggestion:

We can check with @Mdenisco for how to visualize it best.

[Delawen]

Duplicated of #901 but leaving it open because this has suggestions on how to do it.