External price impact warning showing for 0.0%

[tomjeatt]

Is this right? Feel like we shouldn't be showing it for 0, but maybe an edge case:

[peterslany]

I think the problem here is that ETH amount shows as 0 - probably the price is unavailable?

And I guess the calculation of price impact returns 0 in such case. So the question is how do we want to handle case when price of one of the assets is unavailable.