check the errors in `testRoundTripFuzz`

[thedavidmeister]

    function testRoundTripFuzz(Float a, Float b) external {
        try this.powerExternal(a, b) returns (Float c) {
            // If b is zero we'll divide by zero on the inv.
            // If c is 1 then it's not round trippable because 1^x = 1 for all x.
            // C will be 1 when a is 1 or b is 0 (or very close to either).
            if (b.isZero() || c.eq(LibDecimalFloat.packLossless(1, 0))) {} else {
                Float inv = b.inv();
                try this.powerExternal(c, inv) returns (Float roundTrip) {
                    if (roundTrip.isZero()) {} else {
                        Float diff = a.divide(roundTrip).sub(LibDecimalFloat.packLossless(1, 0)).abs();
                        assertTrue(!diff.gt(diffLimit()), "diff");
                    }
                } catch (bytes memory err) {}
            }
        } catch (bytes memory err) {}
    }

these catches need to be handled