Bad error message when "tiles_list_in_file" parameter is wrong

In the config file, there is a key in [Processing] group that allow to give a file for tiles list.

This parameter "tile_list_in_file" must have a filename containing all the tiles to be processed.

If this file doesn't exist, S1Tiling returns the following error:

CRITICAL - No option 'tiles' in section: 'Processing'
Please fix the configuration file '/home/il/koleckt/tropisco/preprocess/GA/AS.cfg'.

It should be

CRITICAL - File not found for 'tiles_list_in_file' in section: 'Processing'
Please fix the configuration file '/home/il/koleckt/tropisco/preprocess/GA/AS.cfg'.