TypeError: expected string or buffer when parsing simple field instr

[kylegibson]

No example document available currently, but my guess is that instr is None.

  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/html.py", line 211, in export
    for result in super(PyDocXHTMLExporter, self).export()
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/html.py", line 209, in <genexpr>
    result.to_html() if isinstance(result, HtmlTag)
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/base.py", line 119, in export
    for result in self.export_node(document):
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/base.py", line 214, in export_node
    for result in results:
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/html.py", line 127, in apply
    for result in results:
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/base.py", line 214, in export_node
    for result in results:
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/html.py", line 127, in apply
    for result in results:
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/base.py", line 248, in yield_nested
    for result in func(item):
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/base.py", line 214, in export_node
    for result in results:
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/html.py", line 278, in export_paragraph
    results = is_not_empty_and_not_only_whitespace(results)
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/html.py", line 78, in is_not_empty_and_not_only_whitespace
    for item in gen:
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/base.py", line 248, in yield_nested
    for result in func(item):
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/base.py", line 212, in export_node
    results = caller(node)
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/export/base.py", line 513, in export_simple_field
    parsed_instr = simple_field.parse_instr()
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/openxml/wordprocessing/simple_field.py", line 41, in parse_instr
    m = self._parse_instr_into_field_type_and_arg_string()
  File "/home/policystat/env/lib/python2.7/site-packages/pydocx/openxml/wordprocessing/simple_field.py", line 35, in _parse_instr_into_field_type_and_arg_string
    return re.match('^\s*([^\s]+)\s*(.*)$', self.instr)
  File "/home/policystat/env/lib/python2.7/re.py", line 137, in match
    return _compile(pattern, flags).match(string)
TypeError: expected string or buffer

[winhamwr]

I think #219 might contain an example of a document demonstrating this bug.