Added missing email field to profile.yaml

Recently, whenever I try to initialize H5R on localhost via /database/load_all, GAE reported internal error. Because missing email field had been referred from main.py at line 640 like below.

```python
twitter_account=profile.get('twitter'),
email=profile['email'], # HERE!
lanyrd=profile.get('lanyrd', False),
```

For avoiding this situation, I've inserted empty email field to that place. I don't know why it suddenly shows up. Anyway it needs to be checked before merging this PR.

cc @PaulKinlan