[mini] fix bug if next state was outside #323
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If a step was recorded at the edge of the world such that the NextState would be "outside" the reconstruction algorithm would try to access a outside volume that doesn't exist in the lookup table. This would lead to a segfault.
This PR adds a safeguard against that case. The scenario is unrealistic in a real setup, but should be avoided for stability (and the error was observed in some small tests)