fix error handling and construct xname on init rather than every message

I have no idea why that 'catch' was there. There is nothing to go
wrong during publish except the exchange may not be found. Which the
'catch' wasn't catching since that is just an ordinary {error,
not_found} return. Cue explosion. So now we handle that and print a
nice error message.
Also, there is no point constructing the exchange name for every
message; doing that once, on init, is enough. That has the further
advantage that now the implementation matches the spec
(rabbit_exchange:name() is a qualified name, not a binary).

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