Senders without a "!" in their nick!ident@host string (not yet sure how/why that happens, but that's what my Quassel core is sending...) no longer cause an ArrayIndexOutOfBounds exception to be thrown in IrcMessage::getHostmask(), which would cause a crash when displaying buffers with affected senders.
Merge pull request #184 from aziraphale/pr/ircmessage-gethostmask-aioobe-fix

Fix ArrayIndexOutOfBoundsException in IrcMessage::getHostmask() with senders with no "!"