Resolve "Mosaic do not work anymore with rgb mode"

Rémi Cressonrequested to merge
2004-mosaic_rgb into develop

Closes #2004 (closed)

Two changes:

  • otb::FunctorImageFilter now allows upstream propagation of empty regions (this might have sense, like in Mosaic filters)
  • Minor change in Mosaic app: the SetCorrectionModel() function (assigning correction model to the mosaic filters) was called twice. Not a big impact on performances but one less useless call and associated logging.

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