Hello,
While following the iterparse / modifying the tree docs
(https://lxml.de/4.5/parsing.html#modifying-the-tree) in attempt to clean up
preceding siblings, code raises a TypeError: 'NoneType' object does not support
item deletion when the XML contains a comment preceding the root element.
Please advise on a workaround for this use case if this is not a potential bug.
See below reproducible example. Thank you for your time and review.
```python
from io import BytesIO
import lxml.etree as ET
xml_txt = '''\
<!-- it will choke on this comment -->
<issue>
<type>BUG</type>
</issue>
'''.encode('utf-8')
iterparse_columns = {
"issue": ["type"]
}
data = []
for event, elem in ET.iterparse(BytesIO(xml_txt), events=('start', 'end')):
node = next(iter(iterparse_columns))
curr_elem = (
elem.tag.split('}')[1] if '}' in elem.tag else elem.tag
)
if event == 'start':
if curr_elem == node:
row = {}
for col in iterparse_columns[node]:
if curr_elem == col:
row[col] = (
elem.text.strip()
if elem.text is not None
else elem.text
)
if col in elem.attrib:
row[col] = elem.attrib[col].strip()
if event == 'end':
if curr_elem == node:
data.append(row)
elem.clear()
while elem.getprevious() is not None:
del elem.getparent()[0]
print(data)
```
Full traceback:
```
Traceback (most recent call last):
File "iterparse_parent_comment_reprex.py", line 43, in <module>
del elem.getparent()[0]
TypeError: 'NoneType' object does not support item deletion
```
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