fix: don't panic with todo!() on inaccessible dir

Fixes #655

src/output/color_scale.rs

@@ -1,4 +1,5 @@
 use ansiterm::{Colour, Style};
+use log::trace;
 use palette::{FromColor, Oklab, Srgb};
 
 use crate::{
@@ -156,7 +157,7 @@ fn update_information_recursively(
                         r,
                     );
                 }
-                Err(_) => todo!(),
+                Err(e) => trace!("Unable to access directory {}: {}", file.name, e),
             }
         };
     }