The heavy emphatic ending is نَّ; the light is نْ. The textbook keeps separate columns and puts — in slots for which it supplies no light-emphasis form.
TypeEndingExample / interpretation
Heavyنَّلَيَرْضَيَنَّ
Lightنْلَيَرْضَيَنْ
Blank—No form given in that source slot
A dash is not a negative particle or a new verb form. Do not manufacture a paradigm entry for source slots that are explicitly left blank.