From b609047d6463cac69345d50d693be945ba87b27e Mon Sep 17 00:00:00 2001
From: J0J0 T <jojo@peek-a-boo.at>
Date: Wed, 2 Mar 2022 16:29:07 +0100
Subject: [PATCH] discogs: Add extract_release_id_regex sanity check

Check whether any input worth pattern checking was passed.
---
 beetsplug/discogs.py | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/beetsplug/discogs.py b/beetsplug/discogs.py
index 820a0acbd..30aa6d28d 100644
--- a/beetsplug/discogs.py
+++ b/beetsplug/discogs.py
@@ -194,16 +194,17 @@ class DiscogsPlugin(BeetsPlugin):
         # patterns.
         # Regex has been tested here https://regex101.com/r/wyLdB4/2
 
-        for pattern in [
-                r'^\[?r?(?P<id>\d+)\]?$',
-                r'discogs\.com/release/(?P<id>\d+)-',
-                r'discogs\.com/[^/]+/release/(?P<id>\d+)',
-        ]:
-            match = re.search(pattern, album_id)
-            if match:
-                return int(match.group('id'))
-
-        return None
+        if album_id:
+            for pattern in [
+                    r'^\[?r?(?P<id>\d+)\]?$',
+                    r'discogs\.com/release/(?P<id>\d+)-',
+                    r'discogs\.com/[^/]+/release/(?P<id>\d+)',
+            ]:
+                match = re.search(pattern, album_id)
+                if match:
+                    return int(match.group('id'))
+        else:
+            return None
 
     def album_for_id(self, album_id):
         """Fetches an album by its Discogs ID and returns an AlbumInfo object