Fix 500 when saving /site/edit without email
When saving /site/edit with no no_reply_email set, a 500 error page
would be returned due to an empty value being passed as value to
the datastore (which is not allowed for email fields).
Copyright (C) 2008 Google Inc.
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Installing the library:
python ./setup.py install
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Testing the library:
python ./setup.py test