fix a bug when updating indexed fields

lib/stormy/controllers/admin_controller.rb

@@ -56,6 +56,7 @@ module Stormy
         fields = params.merge({
           'email_verified' => email_changed ? true : @account.email_verified
         })
+        # TODO slice valid field names instead of removing the outliers
         fields.delete('splat')
         fields.delete('captures')
         fields.delete('email')

lib/stormy/models/base.rb

@@ -631,7 +631,7 @@ module Stormy
       end
 
       def update_indexed_field(name, value)
-        value = value.strip
+        value = value.to_s.strip
         orig = send(name)
         if orig != value
           changed = orig.downcase != value.downcase