It's true that a market resolves with "No outcome" if nothing happens, but in France, the timing of events often dictates whether you even can participate in a market, especially when bureaucracy is involved.
Here, a military strike on June 21st wouldn't retroactively impact a market that closed for June 19th or 20th; the administrative cutoff for those dates has already passed, much like a deadline for filing your tax declaration.
What happens on the 21st is a new event entirely, with its own consequences.
It's like trying to claim aides (government aid) for something that happened last month; if you missed the déclaration window, no new event will change that past reality.