Merge branch 'fixing_nan' into 'NIFTy_5'

Fixing NaNs in PoissonEnergy

See merge request !321
11 jobs for NIFTy_5 in 18 minutes and 49 seconds (queued for 2 seconds)
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  Build Docker
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  Test
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  Release
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  Demo Runs
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passed run_curve_fitting #791413

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passed run_ipynb #791408

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  Deploy
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