Implement better error log before the unwrap.

[DFL-Levi]

swap/programs/swap/src/lib.rs

Line 527 in 7bfa4d6

NonZeroU64::new(max_native_pc_qty).unwrap(),

When creating the new token it was returning the promise but i missed it. I was not waiting but the error log i got was pretty bad:
Program log: panicked at 'called Option::unwrap() on a None value', programs/swap/src/lib.rs:527:48

I think program should provide a better error for that case!
As i checked with developer of serum he told me: We can simply add some require! statements before the unwrap.

[beautyfree]

Faced a similar error: