ReadImageInfo fails on slicer output

Description

The slicer output cannot be passed to the ReadImageInfo application.

To reproduce

import pyotb

raster="/home/remi/data/classif.tif"
image = pyotb.DynamicConvert(raster)

# test with slicer
subset_1 = image[0:100,0:100,:]
infos_1 = pyotb.ReadImageInfo(subset_1)  # Fails

# test with extract ROI
subset_2 = pyotb.ExtractROI({"in": image, "startx": 0, "starty": 0, "sizex": 100, "sizey": 100})
infos_2 = pyotb.ReadImageInfo(subset_2)  # Succeed