It might sound weird, but i need to completely hide field if empty (NULL).
Few fields users fill during a specific status via Transition: screen. But sometimes they forget and fill them too early. Even if i set Context fields: Hide when empty, they still find them and try to input data 
Is there a way to create an automate rule to hide/unhide fields?
There are five states for fields:
- Disabled (not in a Screen field)
- Hidden
- Context fields: Hide when empty
- Context fields: visible
- Description fields
I want those fields to be 1 or 2 while empty and 4 then they get data via Transition: screen