Update impact_calc.py

[bergalli]

convert mask from BooleanArray to numpy before calling .nonzero()

Changes proposed in this PR:

• a simple type conversion on a mask variable

This PR fixes #

I ran into an error when running impact.calc(exposures, if_set, tc). The variables seem properly set:

exposures
<climada.entity.exposures.base.Exposures object at 0x16b601e40>
exposures.gdf
              uid                    geometry  value   latitude   longitude  if_TC  centr_TC
0     GACTAFG0001   POINT (68.68634 35.96580)   0.36    35.9658   68.686338      1   1939286
1     GACTALB0001   POINT (19.63345 41.83677)    0.5   41.83677    19.63345      1   1729995
2     GACTALB0002   POINT (19.74361 41.50308)   1.33  41.503079   19.743606      1   1740796
3     GACTALB0003   POINT (19.72534 41.54909)    1.4  41.549091   19.725338      1   1740796
4     GACTALB0004   POINT (20.04514 41.12010)    0.3  41.120103   20.045136      1   1755199

The error happens here:

        mask = (
            (self.exposures.gdf.value.values == self.exposures.gdf.value.values)  # value != NaN
            & (self.exposures.gdf.value.values != 0)                              # value != 0
            & (self.exposures.gdf[self.hazard.centr_exp_col].values >= 0)    # centroid assigned
        )

where mask is of BooleanArray type, and a few lines later (where I modified), mask.nonzero() is called and fails.

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[bergalli]

noticed the deprecation warning afterwards

[chahank]

Thank you for the proposal. Could you please explain quickly what the error is that this PR fixes? It is not clear above.