Correction function compute_pivot_tables in ReformScenario

[Lolajossipp]

Correction function compute_pivot_tables in ReformScenario

[clallemand]

@benjello could you have a look to this PR ?

[benjello]

There is obviously an error.
Thanks @Lolajossipp for catching it ! 😃

But the fix might not work if you use a ReformScenario without a reform simulation.
So you may want to use _get_simulation method to access the Simulation instances and use Simulation.compute_pivote_table to compute the pivot table.

Hope it helps.

[benjello]

@Lolajossipp : you can also add a specific test reproducing your use case.

[Lolajossipp]

@clallemand

[benjello]

L'idéal pour un test est d'avoir un assert pour tester spécifiquement un point.
Après si le temps presse ...

[benjello]

@Lolajossipp : I had in mind adding an assert in the test you wrote. But it is not very important, you can move on and merge this PR if you are in a hurry.