Missing icons file - when viewing the icons for a calendar event on master, a 404 is returned.
theme/image.php:89 $theme->resolve_image_location($image, $component); returns null where $image = 'icon' and $component = 'moodle'.

None of the conditions in lib/outputlib.php->resolve_image_location are met:

• $this->dir/pix_core/$image
• $parent_config->dir/pix_core/$image
• $CFG->dirroot/pix/$image

A find on the repository also reveals no files named 'icon'