Include minimum password length in change password form. Error messag…

…e to the user should be included.

userena/views.py

@@ -610,7 +610,7 @@ def password_change(request, username, template_name='userena/password_form.html
 
     if request.method == "POST":
         form = pass_form(user=user, data=request.POST)
-        if form.is_valid():
+        if form.is_valid() and ( len(request.POST.get('new_password1')) >= userena_settings.USERENA_PASSWORD_MIN_LENGTH):
             form.save()
 
             # Send a signal that the password has changed