detailed_questions field is logically optional but constrained to be non-null

possibly related to #1002984: Notice: Undefined property: stdClass::$detailed_question in faq_form() (line 231

Originally reported at #1058750: Failing to import for node_export

The detailed_question field is marked in the schema API as NOT NULL

The faq_load function does not add this parameter if the value would be empty

The faq_form function sets the parameter to "" if it does not exist

and faq_save requires the field to be present (by virtue of the NOT NULL constraint)

All this works out OK if you use the form to create the node that you save - but you can't load a node do $stuff to it, then save it again.

If you do you get an error

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'detailed_question' cannot be null: INSERT INTO {faq_questions} (nid, vid, question, detailed_question) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3); 

Removing the null constraint seems the safest change to fix this and works for me - I'll cook up a patch.