source-sim-matrix job failing for some regions

```
2025-01-27 17:29:29 [warning ] Source The Indian Express has no articles. Skipping...
2025-01-27 17:29:29 [warning ] Source The New Indian Express has no articles. Skipping...
2025-01-27 17:29:29 [warning ] Source The New York Times has no articles. Skipping...
2025-01-27 17:29:29 [warning ] Source The New Yorker has no articles. Skipping...
2025-01-27 17:29:29 [warning ] Source The News Minute has no articles. Skipping...
2025-01-27 17:29:29 [warning ] Source The Quint has no articles. Skipping...
115it [00:00, 1607.96it/s]
Traceback (most recent call last):
File "/app/source-similarity-matrix.py", line 70, in
f"Source {sources_df[sources_df.publisher_id == publisher_id].publisher_name.item()} has no articles. Skipping...")
File "/usr/local/lib/python3.9/site-packages/pandas/core/base.py", line 347, in item
raise ValueError("can only convert an array of size 1 to a Python scalar")
ValueError: can only convert an array of size 1 to a Python scalar
```

- [ ] If there is an error do not fail the entire job, wrap in a try/except block and continue processing
- [ ] Add error logging for this failing condition, include the feed name if possible.