A capability (query, DUI, CF) with no attached managed resources causes an generation warning

[jadelkhoury]

If the user models a capability, but does not add a resource to it, a warning is caused in the logs. Why? The code generator assumes there is at least 1 such resource.

Option1: Change code generator to work with "AbstractResource" class.
Option2: Produce a warning/error and a dialog to inform user of the problem. and then don't continue with generation.

I prefer option1.

[berezovskyi]

I also prefer option 1.

How would a user get the Designer to generate a capability for AbstractResource if we go option 2? Last time I tried, it was not simple (but I also tried to return a collection of AbstractResources, so don't mind).