empty richtext shouldn't be None

[iham]

whenever you create a type using a Richtext field, leaving it empty doesn't create a RichtextValue, so you can't simply ask the field for it's raw or output value.

so each time using it, you need to test if the field is there and it isn't "None".
no fun in templates nor in code.

A richtext field should be an empty richtextvalue, not "None".
because then you can ask the field for its raw or output value.
and if this is an empty string -> fine: don't display it (according to your templates needs)