There are manga which will forever have 0 volumes in the database because they were published as one-shots or specials, but the app doesn't let users fully "complete" them because it never changes the "0/? +1 vo" button for finished, completed manga with no volumes. My suggestion is for the app to replace the "0/? +1 vo" with 0/0 (similar to how a completed manga with 14 vols would show as 14/14) when the following conditions are met: 1) a manga is labelled "finished" in the database, 2) there is no volume information in the database, and 3) the user marks such a manga as "completed". I believe this would not interfere with mangas that have volumes but the total number is unknown yet, because these mangas are not marked "finished".
There are manga which will forever have 0 volumes in the database because they were published as one-shots or specials, but the app doesn't let users fully "complete" them because it never changes the "0/? +1 vo" button for finished, completed manga with no volumes. My suggestion is for the app to replace the "0/? +1 vo" with 0/0 (similar to how a completed manga with 14 vols would show as 14/14) when the following conditions are met: 1) a manga is labelled "finished" in the database, 2) there is no volume information in the database, and 3) the user marks such a manga as "completed". I believe this would not interfere with mangas that have volumes but the total number is unknown yet, because these mangas are not marked "finished".