remove_channel_backup: a channel backup might be in both lists

electrum/lnworker.py

@@ -2511,13 +2511,16 @@ class LNWallet(LNWorker):
     def remove_channel_backup(self, channel_id):
         chan = self.channel_backups[channel_id]
         assert chan.can_be_deleted()
+        found = False
         onchain_backups = self.db.get_dict("onchain_channel_backups")
         imported_backups = self.db.get_dict("imported_channel_backups")
         if channel_id.hex() in onchain_backups:
             onchain_backups.pop(channel_id.hex())
-        elif channel_id.hex() in imported_backups:
+            found = True
+        if channel_id.hex() in imported_backups:
             imported_backups.pop(channel_id.hex())
-        else:
+            found = True
+        if not found:
             raise Exception('Channel not found')
         with self.lock:
             self._channel_backups.pop(channel_id)