fix warning for zero weights (i.e. masked pixels)

glenco / lensed

forward reconstruction of lenses and sources from strong lensing observations

http://glenco.github.io/lensed/

MIT License

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Closed ntessore closed 8 years ago

ntessore commented 8 years ago

The check from #224 for invalid weights will also complain about masked pixels, which have zero weight. This was fixed in this PR.