UnicodeDecode error checking a UTF8 page

[Curtis Hovey]

I see an error when editing a html page that has a meta tag that states it is UTF-8. The checker appears to be working in that I am seeing XML syntax errors being reported.

Traceback (most recent call last):
  File "/home/curtis/.local/share/gedit/plugins/gdpformat.py", line 163, in on_document_saved
    self.controller.check_style(None, None, True)
  File "/home/curtis/.local/share/gedit/plugins/gdp/format.py", line 321, in check_style
    self._check_style(document)
  File "/home/curtis/.local/share/gedit/plugins/gdp/format.py", line 313, in _check_style
    checker.check()
  File "/usr/lib/pymodules/python2.7/pocketlint/formatcheck.py", line 267, in check
    XMLChecker(self.file_path, self.text, self._reporter).check()
  File "/usr/lib/pymodules/python2.7/pocketlint/formatcheck.py", line 366, in check
    ElementTree.parse(StringIO(text), parser)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1183, in parse
    tree.parse(source, parser)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 656, in parse
    parser.feed(data)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1641, in feed
    self._parser.Parse(data, 0)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1544, in _start_list
    return self.target.start(tag, attrib)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1419, in start
    self._flush()
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1392, in _flush
    text = "".join(self._data)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xa0 in position 0: ordinal not in range(128)