Guard against availability of modulegraph.InvalidCompiledModule
Guard against availability of modulegraph.InvalidCompiledModule

InvalidCompiledModule is a new class in a future version of modulegraph
that I haven't pushed to bitbucket yet, while py2app's use of that
class was pushed out :-(.

For now py2app checks for the existance of the class before trying to
use it.

metachris/py2app,metachris/py2app,metachris/py2app,metachris/py2app