commit 0504b5ab1a536a6cb4742ae41a69798396d68487
Author: Bùi Thành Nhân <hi@imnhan.com>
Date:   Sat Sep 4 11:45:49 2021 +0700

    handle mangadex "none" volume

diff --git a/src/mangoapi/mangadex.py b/src/mangoapi/mangadex.py
index 209eff4..9a2df2d 100644
--- a/src/mangoapi/mangadex.py
+++ b/src/mangoapi/mangadex.py
@@ -78,7 +78,9 @@ def get_chapters_list(self, title_id):
                         "id": chap["id"],
                         "name": "",
                         "groups": [],  # TODO
-                        "volume": vol["volume"],
+                        "volume": vol["volume"]
+                        if vol["volume"] not in (None, "none")
+                        else "",
                         **_parse_chapter_number(chap["chapter"]),
                     }
                     for chap in vol["chapters"].values()  # again, fucking yikes