Whether a delta op is an UNCLOSED note: one written with no closing marker (\f with no \f*),
which USJ marks closed: "false". Such a note is edited in place in the text, as PT9 does its
opennote.
Parameters
op: undefined|Op
The op to check; anything other than a note embed is not an unclosed note
Whether a delta op is an UNCLOSED note: one written with no closing marker (
\fwith no\f*), which USJ marksclosed: "false". Such a note is edited in place in the text, as PT9 does itsopennote.