a new version of Moose Development:
FAMIXInvocation>>isStub
isStub
"a FAMIXInvocation is stub if it has at less one candidate -invoked-
methode, if one of the candidate methods is stub, or if the invocation
is done by a stub method"
^self candidateList isNil
or: [self candidateList isEmpty
or: [(self candidateList anySatisfy: [:mtd| mtd isStub])
or: [self invokedBy isStub]]]