Missing album art, auto own image.
Rather than having multiple missing album ar as potential fixes, have a default image of your own choice that automatically gets uplaoded & inserted into the music file. (done within the settings) When time allows you can search for no album art files & correctly change to an alternative if required or leave a is.
"When time allows you can search for no album art files"
Why can't you use the missing art filter for this? On the left of the albums page?