Make return of decomp_and_color easier to read

pdaltools/color.py

@@ -155,13 +155,15 @@ def decomp_and_color(
         pipeline |= pdal.Filter.colorization(raster=veget_index_file, dimensions="Deviation:1:256.0")
         writer_extra_dims = ["Deviation=ushort"]
 
+    tmp_ortho = None
     if color_rvb_enabled:
         tmp_ortho = tempfile.NamedTemporaryFile().name
         download_image_from_geoportail_retrying(
             proj, "ORTHOIMAGERY.ORTHOPHOTOS", minx, miny, maxx, maxy, pixel_per_meter, tmp_ortho, timeout_second
         )
         pipeline |= pdal.Filter.colorization(raster=tmp_ortho, dimensions="Red:1:256.0, Green:2:256.0, Blue:3:256.0")
 
+    color_ir_enabled = None
     if color_ir_enabled:
         tmp_ortho_irc = tempfile.NamedTemporaryFile().name
         download_image_from_geoportail_retrying(
@@ -176,7 +178,7 @@ def decomp_and_color(
 
     # The files are deleted only when their reference are lost.
     # See: https://docs.python.org/2/library/tempfile.html#tempfile.TemporaryFile
-    return tmp_ortho if color_rvb_enabled else None, tmp_ortho_irc if color_ir_enabled else None
+    return tmp_ortho, tmp_ortho_irc
 
 
 # https://gis.stackexchange.com/questions/413191/python-pdal-error-reading-format-1-4-las-file-readers-las-error-global-enco