* Cédric Krier [2018-12-05 19:32:19]:
> I do not understand how forgetting an attribute can lead to using
> this attribute.
If the icon is a field and the value of the field is the empty string
> Also I prefer crash when something is wrong than silently ignoring.
It could be considered that an empty icon name is not a mistake thus
returning a rejected promise would just prevent displaying any icon.