DM-48920-v29: Backport changes to avoid repeated NO_DATA patterns in templates #390
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Having NaN values in the weight that multiplies images is bad, since a single bad image can ruin a pixel regardless of other inputs. Since we are setting its corresponding weight to be zero, we kill its image (and variance) values also by multiplying by zero.
In case the variance plane has zeros resulting in inf values in weight, that needs to be cleared out as well. Instead of mapping only NaN values to zero, we mapping non-finite values to zero more generally.
It is inconsistent to set quantities to zero, and not guard against division by the same quantities. Right before the division, we map zeros to inf, so the image and variance values of those pixels are zeros. We also set NO_DATA mask bit when that happens.
This unit test mimics a condition that triggered DM-48920.
These additional changes address more of the divide by zero and NaN warnings
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