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Fix issue with flagged channels in combination with -deconvolution-channels

Andre Offringa requested to merge fix-deconvolution-channels-nan-bug into main

Reported by Cristina. This bug presents it self by making WSClean crash during the sub-image splitting procedure. This is caused by NaNs in the image. These NaNs are caused by an oversight in the deconvolution channel averaging: an image with zero weight is still added in, but an image with zero weight means that it has no gridded visibilities, and is therefore set to NaN.

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