wiki.py Issue with empty <p> tags

If a page has something like:

```
    <p><br />
    </p>
```

the code

```
msg = ''.join(soup.p.findAll(text=True))
```

returns an empty string.
To avoid this you can use:

```
    for para in soup.findAll('p'):
        if not para.text == "":
            msg = msg + para.text
```
