Blackout hours calculation fails when there is 0 installed electricity production capacity

[mabijkerk]

In this scenario I removed all the electricity production capacity from a blank Schiermonnikoog scenario, except for 0.1 MW of solar PV.

If I then remove the last 0.1 MW capacity, this is not processed by the model. The slider says it is set at 0.0 MW, but in the engine the production of solar PV stays the same. On pro I get an engine error, 422 (Unprocessable Content). Locally I get a more informative error message:

@noracato is this something you can look into at some point? It is very much an edge case, so no high priority.

[github-actions]

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