Add a todo to remind devs to develop a unit test when test data are a…

…vailable

pdaltools/color.py

@@ -125,6 +125,7 @@ def pdal_info_json(input_file: str):
     return json_info
 
 
+# TODO: unit test to check that orthoimages are kept outside this function scope (start from test_decomp_and_color)
 @copy_and_hack_decorator
 def decomp_and_color(
     input_file: str,