Currently when selecting a multi-part note such as a biog/hist note, the default display includes a text block in which content is required. But that requirement is no longer true. So instead, present the user with the requirement to add at least one sub-note from the types in the drop down options for note parts. See https://www.pivotaltracker.com/story/show/65000166
Why would someone add a multipart note with no text?
It's not that the note doesn't contain text, it's that the note might not contain any paragraphs. For example, the note might simply contain a list. Right now, the only way to add a list is to use the multi-part note feature (just like in the AT; but in the AT, a paragraph section wasn't required when creating a multi-part note).
Sorry. The "text part" means the type of sub-note that is permissible, of which there are four types: Chronology, Defined List, Ordered List, and Text. Any multi-part note should require one sub-part, but any one of the four types of parts should satisfy the requirement. Type = "text" should not be required.