Comment 17 for bug 1185701

Description of problem:
Using of etree.iterparse() on valid xml throw a weird exception without description.

Version-Release number of selected component (if applicable):
Version: 2.3.5
Release: 1.fc17

How reproducible:

XML:
====
<?xml version="1.0" encoding="UTF-8"?>
<metadata>
<foo>
  <bar>a</bar>
</foo>
<foo>
  <bar>b</bar>
</foo>
</metadata>

Reproducer:
===========
#!/usr/bin/python
from lxml import etree
for element in etree.iterparse(open("xml.xml")):
    print element[0], element[1].tag

Actual results:
end bar
end foo
end bar
end foo
end metadata
Traceback (most recent call last):
  File "./reproducer.py", line 3, in <module>
    for element in etree.iterparse(open("xml.xml")):
  File "iterparse.pxi", line 491, in lxml.etree.iterparse.__next__ (src/lxml/lxml.etree.c:103790)
  File "iterparse.pxi", line 543, in lxml.etree.iterparse._read_more_events (src/lxml/lxml.etree.c:104333)
  File "parser.pxi", line 601, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:79743)
lxml.etree.XMLSyntaxError: None

Expected results:
end bar
end foo
end bar
end foo
end metadata