Closing details and reopening throws an error

[sievers2501]

To see this, you need to generate a big enough sample to create a situation where opening the details page will take a few seconds. Run a bunch of hands, and then

1. Click details.
2. Before the details popup can display, hit close.
3. Hit details again.

You get an error page.

155 |     o.generation.solutionStats
  156 |   )
  157 | ) {
> 158 |   throw new Error(
      | ^  159 |     "Combining stat result sets is not implemented"
  160 |   );
  161 | }