Revert "FIX: replace otb::FunctorImageFilter with itk::UnaryFunctorImageFilter to fix #2004"

This reverts commit 77299c78.

Modules/Applications/AppImageUtils/app/otbMosaic.cxx

@@ -737,7 +737,6 @@ private:
   void PrepareMosaicFilter(typename TMosaicFilterType::Pointer& filter)
   {
     SetInterpolator<TMosaicFilterType>(filter);
-    SetCorrectionModel<TMosaicFilterType>(filter);
     SetSpacing<TMosaicFilterType>(filter);
     SetNoDataValue<TMosaicFilterType>(filter);
     SetCorrectionModel<TMosaicFilterType>(filter);

Modules/Core/Functor/include/otbFunctorImageFilter.hxx

@@ -49,7 +49,7 @@ int SetInputRequestedRegion(const T* img, const itk::ImageRegion<2>& region, con
   // The ugly cast in all ITK filters
   T* nonConstImg = const_cast<T*>(img);
 
-  if (currentRegion.Crop(img->GetLargestPossibleRegion()))
+  if (currentRegion.GetNumberOfPixels()==0 || currentRegion.Crop(img->GetLargestPossibleRegion()))
   {
     nonConstImg->SetRequestedRegion(currentRegion);
     return 0;