Hello Squeak-dev,

SharedQueue>>#nextOrNil is deliberately implemented in such a way, that 
it raises an error instead of returning nil, in case the Queue is empty. 
>From the versions, it is obvious that this change was an 'improvement'. 
Can anybody remember _why_ this change was done?

 From a discussion in Mantis I know that for new projects, one should 
use SharedQueue2 instead. But I can't change to SharedQueue2 because the 
receiver is DeferredUIMessages, a class variable of WorldState.

Thank you.
  - Lars