id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
1250629388,I_kwDOCGYnMM5KixcM,440,CSV files with too many values in a row cause errors,4068,closed,0,,,20,2022-05-27T10:54:44Z,2022-06-14T22:23:01Z,2022-06-14T20:12:46Z,NONE,,"*Original title: csv.DictReader can have None as key*

In some cases, `csv.DictReader` can have `None` as key for unnamed columns, and a list of values as value.
`sqlite_utils.utils.rows_from_file` cannot handle that:

```python
url=""https://artsdatabanken.no/Fab2018/api/export/csv""
db = sqlite_utils.Database("":memory"")

with urlopen(url) as fab:
    reader, _ = sqlite_utils.utils.rows_from_file(fab, encoding=""utf-16le"")   
    db[""fab2018""].insert_all(reader, pk=""Id"")
```

Result:
```
Traceback (most recent call last):
  File ""<stdin>"", line 3, in <module>
  File ""/home/user/.local/pipx/venvs/sqlite-utils/lib/python3.8/site-packages/sqlite_utils/db.py"", line 2924, in insert_all
    chunk = list(chunk)
  File ""/home/user/.local/pipx/venvs/sqlite-utils/lib/python3.8/site-packages/sqlite_utils/db.py"", line 3454, in fix_square_braces
    if any(""["" in key or ""]"" in key for key in record.keys()):
  File ""/home/user/.local/pipx/venvs/sqlite-utils/lib/python3.8/site-packages/sqlite_utils/db.py"", line 3454, in <genexpr>
    if any(""["" in key or ""]"" in key for key in record.keys()):
TypeError: argument of type 'NoneType' is not iterable
```

Code:
https://github.com/simonw/sqlite-utils/blob/59be60c471fd7a2c4be7f75e8911163e618ff5ca/sqlite_utils/db.py#L3454

`sqlite-utils insert` from command line is not affected by this issue.",140912432,issue,,,"{""url"": ""https://api.github.com/repos/simonw/sqlite-utils/issues/440/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed