Incompatible changes to `MassActionProblemData`

[tim-at-topos]

In #1045 the struct/interface MassActionProblemData was changed by adding the following fields:

• massConservationType
• transitionProductionRates
• transitionConsumptionRates
• placeProductionRates
• placeConsumptionRates

This means that previous analysis documents with a mass-action dynamics analysis will no longer load correctly, since their MassActionProblemData will be missing these fields.

[tim-at-topos]

Sorry for introducing such a bad breaking bug... I have no idea how I didn't see this in testing.

[epatters]

That's alright! This is why we have a staging server.

Also, in retrospect, I should have noticed that problem when reviewing.