Line 332 in color.module does
$paths['color'] = 'public://color';
However, Drupal allows me to only enter a private file path in my file system settings, and leaving the public files directory empty. Drupal works fine, until I try to change the colors of my theme. Then Drupal generates some bugs as
The file permissions could not be set on public://color.
File temporary://fileCUgZxH could not be copied, because the destination directory is not configured correctly.
Is it possible to use the private file system, if the user prefers that? Of if not, just check if the public file directory is set?