Visualizations: handle r2 = null

[asizemore]

On the qa and live site, when we use this combination of variables in the scatter along with the line of best fit option, we get the following error:

The scatterplot response looks fine, just that one of the r2 values is null instead of a number.

[moontrip]

@asizemore you are great to find bugs! 😄 I will look at this case and try to handle the case better

[asizemore]

Thanks @moontrip !!

[aaronwlsong]

It looks good now. Closing ticket.