This is a contribution to help others who might find this confusing:
In French, there are certain sentence constructions or even verbs that could be made negative with just the addition of "ne". The addition of "pas" and the likes isn't necessary. This concept is called "Ne littéraire".
Clauses containing "si" are one of those instances where the Ne littéraire could be used.
For further study of the concept, check: https://www.lawlessfrench.com/grammar/ne-litteraire/
Reading B1, Family & Relationships, Listening or Seeing B1, Family & Relationships
Merci pour cette excellente contribution !
Here are a few expressions to illustrate the the 'ne littéraire':
Qu'à cela ne tienne = never mind / so be it (context dependent)
Il ne sait que dire = he doesn't know what to say
Elle n'a daigné répondre = she didn't deign answer
Bonne journée !
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