Merge pull request #28 from seasidesparrow/conf_bibcodes.20240626

blank volume for 9-character bibstems (eg conf)

Author: seasidesparrow

adsenrich/bibcodes.py

@@ -357,6 +357,10 @@ def make_bibcode(self, record, bibstem=None, volume=None):
                     if not issue:
                         issue = is_letter
 
+            # for stem.conf, stem.work, stem.data, stem.book etc...
+            if len(bibstem) == 9:
+                volume = ""
+
             if not issue:
                 pageid = pageid.rjust(5, ".")
                 issue = ""