[web2py] TAG() throws a ticket when string too short

[weheh]

I'm flattening some text, assuming it's html, and get this error
message when the text input is less than 4 characters:

input='abc'
stream=cStringIO.StringIO(TAG(input).flatten())


  File "C:/web2py/applications/myapp/controllers/myfunc.py", line 311,
in process_text_in
    stream=cStringIO.StringIO(TAG(input).flatten())
  File "C:\web2py\gluon\html.py", line 821, in __call__
    return web2pyHTMLParser(decoder.decoder(html)).tree
  File "C:\web2py\gluon\decoder.py", line 72, in decoder
    encoding = autoDetectXMLEncoding(buffer)
  File "C:\web2py\gluon\decoder.py", line 38, in autoDetectXMLEncoding
    bytes = (byte1, byte2, byte3, byte4) = tuple(map(ord,
buffer[0:4]))
ValueError: need more than 3 values to unpack

4 or more characters works OK.