No error when referenced aspects cannot be loaded

[Matthias Schoettle]

When an aspect is loaded that contains instantiations, but they cannot be loaded, there is no error (doesn't crash, good!). However, the user might be unaware that something went wrong.

There should be at least a warning or error message when this happens. I assume that when the TextViews try to load the text through EMF.Edit, they are fail safe in some way, i.e., an empty String is used).

To test this, one can open the .ram file with a text editor and break the relative path to instantiated ram files in the instantiations.