Fix from the Madusa mailing list:
http://groups.yahoo.com/group/medusa/message/333
It's clear that Medusa should not be checking for an empty buffer
via "buf is ''". The patch merely changes "is" to "==". However,
there's a mystery here all the same: Python attempts to store null
strings uniquely, so it's unclear why "buf is ''" ever returned
false when buf actually was empty. *Some* string operations produce
non-unique null strings, e.g.
>>> "abc"*0 is "abc"*0
0
>>>
but they're rare, and I don't see any such operations in asynchat.
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