René Paris authored Mar 10, 2022 and Reinhard Biegel committed Mar 31, 2022

Due to changes in the core, some values might become NaN when agents
leave the world (e.g. Lane). This edgecases are now filled with previous
values.

**NOTE**: This is only a hotfix as it unconditionally fills NaN values.
In some columns NaN values are allowed (e.g. DetectedObjects) and
querying this such columns could lead to erroneous results. With this
fix, only the first transition from "NaN to value" is still correct.

Before  | After
--------+---------
NaN     | NaN
value1  | value1
value2  | value2
NaN     | value2 (filled)