title: SECURITY_PASSWORD_SALT must not be None - flask security
body: <p>This question is related to: <a href="https://stackoverflow.com/questions/25942092/unique-salt-per-user-using-flask-security">Unique Salt per User using Flask-Security</a>, but I'm more concerned with removing this error message.</p>
  
  <p>The linked question established that flask-security uses per-user salts, which is good since a global salt is pointless.</p>
  
  <p>So my question is what's the point of this configuration variable, and what should I set it to to resolve this error? Does it matter what I set it to?<br>
  I don't think I need a global salt since flask-security uses passlib which takes care of salts for me.</p>
  
  <p>(The error message in the title occurs even when copying the example straight from the docs: (<a href="https://pythonhosted.org/Flask-Security/quickstart.html#id6" rel="nofollow noreferrer">peewee example</a>))</p>