5a68e682d9
This patch makes the field generator optional in Atom, allowing to set
an empty string to disable the element in the same way it is disabled in
RSS already:
```python
# disable generator element
fg.generator('')
```
This fixes #89
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| .. | ||
| ext | ||
| __init__.py | ||
| __main__.py | ||
| compat.py | ||
| entry.py | ||
| feed.py | ||
| util.py | ||
| version.py | ||