Change FeedParser.parseStream so it doesn't try to attach to a `stream` that is not defined. A user could pass in a stream thinking it's valid, but the stream has been destroyed. Try not to throw.
Change FeedParser.parseStream so it doesn't try to attach to a `stream` that is not defined. A user could pass in a stream thinking it's valid, but the stream has been destroyed. Try not to throw.

ortoo/node-feedparser,csotiriou/node-feedparser,humblelistener/node-feedparser,csotiriou/node-feedparser,humblelistener/node-feedparser