move all non ascii first letters into _

oml/item/models.py

@@ -9,6 +9,7 @@ import shutil
 import stat
 import unicodedata
 import time
+import string
 
 import ox
 from sqlalchemy.orm import load_only
@@ -772,6 +773,8 @@ class File(db.Model):
             title = '%s (%s)' % (title, extra.strip())
         filename = '%s.%s' % (title, extension)
         first = unicodedata.normalize('NFD', author[0].upper())[0].upper()
+        if first not in string.ascii_uppercase:
+            first = '_'
         new_path = os.path.join(first, author, filename)
         new_path = new_path.replace('\x00', '')
         new_path = new_path.replace('\n', ' ').replace('  ', ' ')