obviate meaningless error messages

core/models/wallets.py

@@ -44,9 +44,13 @@ class Wallet(models.Model):
         wyear = fp.parent.name
         wurl = f"/walletedit/{self.walletname}"  # .replace('#', ':')
 
+        if len(wyear) != 4 or len(wname) !=6: 
+            # no contents.json for old-style wallets
+            return None
+
         jsonfile = Path(settings.DRAWINGS_DATA, "walletjson") / wyear / wname / "contents.json"
         if not Path(jsonfile).is_file():
-            print(f'{jsonfile} is not a file')
+            print(f'{jsonfile} is not a file {wyear=} {wname=} ')
             return None
         else:
             with open(jsonfile) as json_f: