[Twisted-Python] Counting errors in a DeferredList and avoiding Unhandled error in Deferred messages

[Terry Jones]

Hi Jean-Paul

> You can do this (if you replace `pass´ with `None´, anyway) or you can pass
> `consumeErrors=True´ to the `DeferredList´ initializer which will make it
> do something equivalent.

Thanks. Sorry - I should have just read the docs again :-)

Terry