Inversing a line chart using the Stackdriver data source

I am trying to inverse this line chart so that the line sits at 100% and drops when the request yield drops. (errored/total)

I have tried modifying the query from (error/total) to 100-(error/total) however there is no way to default the equation to = 100 rather than 0 if the formula fails (the stackdriver grafana data source has $___timegroup and sumoquery has a function called fillmissing to handle this).

I’ve also seen that the graphite datasource has a function called scale that can be set to -1 to inverse the y axis.

Is there any way that I can invert this line graph using grafana and the Stackdriver plugin?